Adds outline atomics support to Rust's compiler-rt build, since this is required
with a sufficiently new version of clang. Support for these hasn't reached a
stable version of LLVM yet, so we need to pick the changes and the corresponding
build logic in.

diff --git a/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S b/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S
new file mode 100644
index 000000000..5dc0d5320
--- /dev/null
+++ b/src/llvm-project/compiler-rt/lib/builtins/aarch64/lse.S
@@ -0,0 +1,236 @@
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include "assembly.h"
+
+// Out-of-line LSE atomics helpers. Ported from libgcc library.
+// N = {1, 2, 4, 8}
+// M = {1, 2, 4, 8, 16}
+// ORDER = {'relax', 'acq', 'rel', 'acq_rel'}
+// Routines implemented:
+//
+//  iM __aarch64_casM_ORDER(iM expected, iM desired, iM *ptr)
+//  iN __aarch64_swpN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldaddN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldclrN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldeorN_ORDER(iN val, iN *ptr)
+//  iN __aarch64_ldsetN_ORDER(iN val, iN *ptr)
+//
+// Routines may modify temporary registers tmp0, tmp1, tmp2,
+// return value x0 and the flags only.
+
+#ifdef __aarch64__
+
+#ifdef HAS_ASM_LSE
+.arch armv8-a+lse
+#else
+.arch armv8-a
+#endif
+
+#if !defined(__APPLE__)
+HIDDEN(__aarch64_have_lse_atomics)
+#else
+HIDDEN(___aarch64_have_lse_atomics)
+#endif
+
+// Generate mnemonics for
+// L_cas:                                 SIZE: 1,2,4,8,16 MODEL: 1,2,3,4
+// L_swp L_ldadd L_ldclr L_ldeor L_ldset: SIZE: 1,2,4,8    MODEL: 1,2,3,4
+
+#if SIZE == 1
+#define S b
+#define UXT uxtb
+#define B 0x00000000
+#elif SIZE == 2
+#define S h
+#define UXT uxth
+#define B 0x40000000
+#elif SIZE == 4 || SIZE == 8 || SIZE == 16
+#define S
+#define UXT mov
+#if SIZE == 4
+#define B 0x80000000
+#elif SIZE == 8
+#define B 0xc0000000
+#endif
+#else
+#error
+#endif // SIZE
+
+#if MODEL == 1
+#define SUFF _relax
+#define A
+#define L
+#define M 0x000000
+#define N 0x000000
+#elif MODEL == 2
+#define SUFF _acq
+#define A a
+#define L
+#define M 0x400000
+#define N 0x800000
+#elif MODEL == 3
+#define SUFF _rel
+#define A
+#define L l
+#define M 0x008000
+#define N 0x400000
+#elif MODEL == 4
+#define SUFF _acq_rel
+#define A a
+#define L l
+#define M 0x408000
+#define N 0xc00000
+#else
+#error
+#endif // MODEL
+
+// Define register size.
+#define x(N) GLUE2(x, N)
+#define w(N) GLUE2(w, N)
+#if SIZE < 8
+#define s(N) w(N)
+#else
+#define s(N) x(N)
+#endif
+
+#define NAME(BASE) GLUE4(__aarch64_, BASE, SIZE, SUFF)
+#define LDXR GLUE4(ld, A, xr, S)
+#define STXR GLUE4(st, L, xr, S)
+
+// Define temporary registers.
+#define tmp0 16
+#define tmp1 17
+#define tmp2 15
+
+// Macro for branch to label if no LSE available
+.macro JUMP_IF_NOT_LSE label
+#if !defined(__APPLE__)
+        adrp    x(tmp0), __aarch64_have_lse_atomics
+        ldrb    w(tmp0), [x(tmp0), :lo12:__aarch64_have_lse_atomics]
+#else
+        adrp    x(tmp0), ___aarch64_have_lse_atomics@page
+        ldrb    w(tmp0), [x(tmp0), ___aarch64_have_lse_atomics@pageoff]
+#endif
+        cbz     w(tmp0), \label
+.endm
+
+#ifdef L_cas
+DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(cas))
+        JUMP_IF_NOT_LSE 8f
+#if SIZE < 16
+#ifdef HAS_ASM_LSE
+#define CAS GLUE4(cas, A, L, S) s(0), s(1), [x2]
+#else
+#define CAS .inst 0x08a07c41 + B + M
+#endif
+        CAS    // s(0), s(1), [x2]
+        ret
+8:
+        UXT    s(tmp0), s(0)
+0:
+        LDXR   s(0), [x2]
+        cmp    s(0), s(tmp0)
+        bne    1f
+        STXR   w(tmp1), s(1), [x2]
+        cbnz   w(tmp1), 0b
+1:
+        ret
+#else
+#define LDXP GLUE3(ld, A, xp)
+#define STXP GLUE3(st, L, xp)
+#ifdef HAS_ASM_LSE
+#define CASP GLUE3(casp, A, L)  x0, x1, x2, x3, [x4]
+#else
+#define CASP .inst 0x48207c82 + M
+#endif
+
+        CASP   // x0, x1, x2, x3, [x4]
+        ret
+8:
+        mov    x(tmp0), x0
+        mov    x(tmp1), x1
+0:
+        LDXP   x0, x1, [x4]
+        cmp    x0, x(tmp0)
+        ccmp   x1, x(tmp1), #0, eq
+        bne    1f
+        STXP   w(tmp2), x2, x3, [x4]
+        cbnz   w(tmp2), 0b
+1:
+        ret
+#endif
+END_COMPILERRT_OUTLINE_FUNCTION(NAME(cas))
+#endif // L_cas
+
+#ifdef L_swp
+#ifdef HAS_ASM_LSE
+#define SWP GLUE4(swp, A, L, S)  s(0), s(0), [x1]
+#else
+#define SWP .inst 0x38208020 + B + N
+#endif
+DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(swp))
+        JUMP_IF_NOT_LSE 8f
+        SWP    // s(0), s(0), [x1]
+        ret
+8:
+        mov    s(tmp0), s(0)
+0:
+        LDXR   s(0), [x1]
+        STXR   w(tmp1), s(tmp0), [x1]
+        cbnz   w(tmp1), 0b
+        ret
+END_COMPILERRT_OUTLINE_FUNCTION(NAME(swp))
+#endif // L_swp
+
+#if defined(L_ldadd) || defined(L_ldclr) ||                                    \
+    defined(L_ldeor) || defined(L_ldset)
+
+#ifdef L_ldadd
+#define LDNM ldadd
+#define OP add
+#define OPN 0x0000
+#elif defined(L_ldclr)
+#define LDNM ldclr
+#define OP bic
+#define OPN 0x1000
+#elif defined(L_ldeor)
+#define LDNM ldeor
+#define OP eor
+#define OPN 0x2000
+#elif defined(L_ldset)
+#define LDNM ldset
+#define OP orr
+#define OPN 0x3000
+#else
+#error
+#endif
+
+#ifdef HAS_ASM_LSE
+#define LDOP GLUE4(LDNM, A, L, S) s(0), s(0), [x1]
+#else
+#define LDOP .inst 0x38200020 + OPN + B + N
+#endif
+
+DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(NAME(LDNM))
+        JUMP_IF_NOT_LSE 8f
+        LDOP // s(0), s(0), [x1]
+        ret
+8:
+        mov    s(tmp0), s(0)
+0:
+        LDXR   s(0), [x1]
+        OP     s(tmp1), s(0), s(tmp0)
+        STXR   w(tmp2), s(tmp1), [x1]
+        cbnz   w(tmp2), 0b
+        ret
+END_COMPILERRT_OUTLINE_FUNCTION(NAME(LDNM))
+#endif // L_ldadd L_ldclr L_ldeor L_ldset
+
+NO_EXEC_STACK_DIRECTIVE
+
+// GNU property note for BTI and PAC
+GNU_PROPERTY_BTI_PAC
+
+#endif // __aarch64__
diff --git a/src/llvm-project/compiler-rt/lib/builtins/assembly.h b/src/llvm-project/compiler-rt/lib/builtins/assembly.h
index f437cb87f..f6ce6a9fc 100644
--- a/src/llvm-project/compiler-rt/lib/builtins/assembly.h
+++ b/src/llvm-project/compiler-rt/lib/builtins/assembly.h
@@ -14,8 +14,8 @@
 #ifndef COMPILERRT_ASSEMBLY_H
 #define COMPILERRT_ASSEMBLY_H
 
-#if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
-#define SEPARATOR @
+#if defined(__APPLE__) && defined(__aarch64__)
+#define SEPARATOR %%
 #else
 #define SEPARATOR ;
 #endif
@@ -35,14 +35,14 @@
 #define HIDDEN(name) .hidden name
 #define LOCAL_LABEL(name) .L_##name
 #define FILE_LEVEL_DIRECTIVE
-#if defined(__arm__)
+#if defined(__arm__) || defined(__aarch64__)
 #define SYMBOL_IS_FUNC(name) .type name,%function
 #else
 #define SYMBOL_IS_FUNC(name) .type name,@function
 #endif
 #define CONST_SECTION .section .rodata
 
-#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
+#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) ||        \
     defined(__linux__)
 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
 #else
@@ -65,6 +65,66 @@
 
 #endif
 
+#if defined(__arm__) || defined(__aarch64__)
+#define FUNC_ALIGN                                                             \
+  .text SEPARATOR                                                              \
+  .balign 16 SEPARATOR
+#else
+#define FUNC_ALIGN
+#endif
+
+// BTI and PAC gnu property note
+#define NT_GNU_PROPERTY_TYPE_0 5
+#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
+#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI 1
+#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC 2
+
+#if defined(__ARM_FEATURE_BTI_DEFAULT)
+#define BTI_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_BTI
+#else
+#define BTI_FLAG 0
+#endif
+
+#if __ARM_FEATURE_PAC_DEFAULT & 3
+#define PAC_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_PAC
+#else
+#define PAC_FLAG 0
+#endif
+
+#define GNU_PROPERTY(type, value)                                              \
+  .pushsection .note.gnu.property, "a" SEPARATOR                               \
+  .p2align 3 SEPARATOR                                                         \
+  .word 4 SEPARATOR                                                            \
+  .word 16 SEPARATOR                                                           \
+  .word NT_GNU_PROPERTY_TYPE_0 SEPARATOR                                       \
+  .asciz "GNU" SEPARATOR                                                       \
+  .word type SEPARATOR                                                         \
+  .word 4 SEPARATOR                                                            \
+  .word value SEPARATOR                                                        \
+  .word 0 SEPARATOR                                                            \
+  .popsection
+
+#if BTI_FLAG != 0
+#define BTI_C bti c
+#else
+#define BTI_C
+#endif
+
+#if (BTI_FLAG | PAC_FLAG) != 0
+#define GNU_PROPERTY_BTI_PAC                                                   \
+  GNU_PROPERTY(GNU_PROPERTY_AARCH64_FEATURE_1_AND, BTI_FLAG | PAC_FLAG)
+#else
+#define GNU_PROPERTY_BTI_PAC
+#endif
+
+#if defined(__clang__) || defined(__GCC_HAVE_DWARF2_CFI_ASM)
+#define CFI_START .cfi_startproc
+#define CFI_END .cfi_endproc
+#else
+#define CFI_START
+#define CFI_END
+#endif
+
 #if defined(__arm__)
 
 // Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros:
@@ -131,8 +191,14 @@
 #define DEFINE_CODE_STATE
 #endif
 
-#define GLUE2(a, b) a##b
-#define GLUE(a, b) GLUE2(a, b)
+#define GLUE2_(a, b) a##b
+#define GLUE(a, b) GLUE2_(a, b)
+#define GLUE2(a, b) GLUE2_(a, b)
+#define GLUE3_(a, b, c) a##b##c
+#define GLUE3(a, b, c) GLUE3_(a, b, c)
+#define GLUE4_(a, b, c, d) a##b##c##d
+#define GLUE4(a, b, c, d) GLUE4_(a, b, c, d)
+
 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
 
 #ifdef VISIBILITY_HIDDEN
@@ -177,6 +243,16 @@
   DECLARE_FUNC_ENCODING                                                        \
   name:
 
+#define DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(name)                     \
+  DEFINE_CODE_STATE                                                            \
+  FUNC_ALIGN                                                                   \
+  .globl name SEPARATOR                                                        \
+  SYMBOL_IS_FUNC(name) SEPARATOR                                               \
+  DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
+  CFI_START SEPARATOR                                                          \
+  DECLARE_FUNC_ENCODING                                                        \
+  name: SEPARATOR BTI_C
+
 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
   .globl SYMBOL_NAME(name) SEPARATOR                                           \
   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
@@ -193,8 +269,13 @@
 #ifdef __ELF__
 #define END_COMPILERRT_FUNCTION(name)                                          \
   .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
+#define END_COMPILERRT_OUTLINE_FUNCTION(name)                                  \
+  CFI_END SEPARATOR                                                            \
+  .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
 #else
 #define END_COMPILERRT_FUNCTION(name)
+#define END_COMPILERRT_OUTLINE_FUNCTION(name)                                  \
+  CFI_END
 #endif
 
 #endif // COMPILERRT_ASSEMBLY_H
diff --git a/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c b/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c
index 468bcc84c..1f72d800f 100644
--- a/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c
+++ b/src/llvm-project/compiler-rt/lib/builtins/cpu_model.c
@@ -12,6 +12,16 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(HAVE_INIT_PRIORITY)
+#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__ 101))
+#elif __has_attribute(__constructor__)
+#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__))
+#else
+// FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that
+// this runs during initialization.
+#define CONSTRUCTOR_ATTRIBUTE
+#endif
+
 #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__) ||           \
      defined(_M_X64)) &&                                                       \
     (defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER))
@@ -656,16 +666,6 @@ static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf,
 #undef setFeature
 }
 
-#if defined(HAVE_INIT_PRIORITY)
-#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__ 101))
-#elif __has_attribute(__constructor__)
-#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__))
-#else
-// FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that
-// this runs during initialization.
-#define CONSTRUCTOR_ATTRIBUTE
-#endif
-
 #ifndef _WIN32
 __attribute__((visibility("hidden")))
 #endif
@@ -741,4 +741,24 @@ int CONSTRUCTOR_ATTRIBUTE __cpu_indicator_init(void) {
   return 0;
 }
 
+#elif defined(__aarch64__)
+// LSE support detection for out-of-line atomics
+// using HWCAP and Auxiliary vector
+_Bool __aarch64_have_lse_atomics
+    __attribute__((visibility("hidden"), nocommon));
+#if defined(__has_include)
+#if __has_include(<sys/auxv.h>)
+#include <sys/auxv.h>
+#ifndef AT_HWCAP
+#define AT_HWCAP 16
+#endif
+#ifndef HWCAP_ATOMICS
+#define HWCAP_ATOMICS (1 << 8)
+#endif
+static void CONSTRUCTOR_ATTRIBUTE init_have_lse_atomics(void) {
+  unsigned long hwcap = getauxval(AT_HWCAP);
+  __aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0;
+}
+#endif // defined(__has_include)
+#endif // __has_include(<sys/auxv.h>)
 #endif
diff --git a/vendor/compiler_builtins/.cargo-checksum.json b/vendor/compiler_builtins/.cargo-checksum.json
index 4322d5560..455b74c98 100644
--- a/vendor/compiler_builtins/.cargo-checksum.json
+++ b/vendor/compiler_builtins/.cargo-checksum.json
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/vendor/compiler_builtins/build.rs b/vendor/compiler_builtins/build.rs
index f948edba9..c57802569 100644
--- a/vendor/compiler_builtins/build.rs
+++ b/vendor/compiler_builtins/build.rs
@@ -81,7 +81,7 @@ mod c {
 
     use std::collections::BTreeMap;
     use std::env;
-    use std::path::PathBuf;
+    use std::path::{Path, PathBuf};
 
     struct Sources {
         // SYMBOL -> PATH TO SOURCE
@@ -487,7 +487,20 @@ mod c {
         // use of that macro in lib/builtins/int_util.h in compiler-rt.
         cfg.flag_if_supported(&format!("-ffile-prefix-map={}=.", root.display()));
 
+        // Include out-of-line atomics for aarch64, which are all generated by supplying different
+        // sets of flags to the same source file.
         let src_dir = root.join("lib/builtins");
+        if target_arch == "aarch64" {
+            let atomics_libs = build_aarch64_out_of_line_atomics_libraries(&src_dir, cfg);
+            if !atomics_libs.is_empty() {
+                for library in  atomics_libs {
+                    cfg.object(library);
+                }
+                // Some run-time CPU feature detection is necessary, as well.
+                sources.extend(&[("__aarch64_have_lse_atomics", "cpu_model.c")]);
+            }
+        }
+
         for (sym, src) in sources.map.iter() {
             let src = src_dir.join(src);
             cfg.file(&src);
@@ -497,4 +510,60 @@ mod c {
 
         cfg.compile("libcompiler-rt.a");
     }
+
+    fn build_aarch64_out_of_line_atomics_libraries(
+        builtins_dir: &Path,
+        cfg: &cc::Build,
+    ) -> Vec<PathBuf> {
+        // NOTE: because we're recompiling the same source file in N different ways, building
+        // serially is necessary. If we want to lift this restriction, we can either:
+        // - create symlinks to lse.S and build those_(though we'd still need to pass special
+        //   #define-like flags to each of these), or
+        // - synthesizing tiny .S files in out/ with the proper #defines, which ultimately #include
+        //   lse.S.
+        // That said, it's unclear how useful this added complexity will be, so just do the simple
+        // thing for now.
+        let outlined_atomics_file = builtins_dir.join("aarch64/lse.S");
+
+        // A stable release hasn't been made with lse.S yet. Until we pick that up, do nothing.
+        if !outlined_atomics_file.exists() {
+            return vec![];
+        }
+
+        println!("cargo:rerun-if-changed={}", outlined_atomics_file.display());
+        let out_dir: PathBuf = env::var("OUT_DIR").unwrap().into();
+
+        // Ideally, this would be a Vec of object files, but cc doesn't make it *entirely*
+        // trivial to build an individual object.
+        let mut atomics_libraries = Vec::new();
+        for instruction_type in &["cas", "cwp", "ldadd", "ldclr", "ldeor", "ldset"] {
+            for size in &[1, 2, 4, 8, 16] {
+                if *size == 16 && *instruction_type != "cas" {
+                    continue;
+                }
+
+                for (model_number, model_name) in
+                    &[(1, "relax"), (2, "acq"), (3, "rel"), (4, "acq_rel")]
+                {
+                    let library_name = format!(
+                        "liboutline_atomic_helper_{}_{}_{}.a",
+                        instruction_type, size, model_name
+                    );
+                    let sym = format!("__aarch64_{}{}_{}", instruction_type, size, model_name);
+                    let mut cfg = cfg.clone();
+
+                    cfg.include(&builtins_dir)
+                        .define(&format!("L_{}", instruction_type), None)
+                        .define("SIZE", size.to_string().as_str())
+                        .define("MODEL", model_number.to_string().as_str())
+                        .file(&outlined_atomics_file);
+                    cfg.compile(&library_name);
+
+                    atomics_libraries.push(out_dir.join(library_name));
+                    println!("cargo:rustc-cfg={}=\"optimized-c\"", sym);
+                }
+            }
+        }
+        atomics_libraries
+    }
 }