Ensure that sanitizer runtimes are built for all our supported x86_64
platforms.

Now that we patch in our own custom -cros and -pc targets instead
of falling back to -unknown, we need to add builds for those
targets as well to allow the linker to find the correct versions
of the librustc_[almt]san static libraries.

diff --git a/src/bootstrap/native.rs b/src/bootstrap/native.rs
index 97d9dbdd63f..d81c5e60608 100644
--- a/src/bootstrap/native.rs
+++ b/src/bootstrap/native.rs
@@ -790,13 +790,16 @@ fn supported_sanitizers(
 
     match &*target.triple {
         "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
-        "aarch64-unknown-linux-gnu" => {
+        "aarch64-unknown-linux-gnu" | "aarch64-cros-linux-gnu" => {
             common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan"])
         }
+        "armv7a-cros-linux-gnueabihf" => {
+            common_libs("linux", "armhf", &["asan"])
+        }
         "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
         "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
         "x86_64-unknown-freebsd" => common_libs("freebsd", "x86_64", &["asan", "msan", "tsan"]),
-        "x86_64-unknown-linux-gnu" => {
+        "x86_64-unknown-linux-gnu" | "x86_64-cros-linux-gnu" | "x86_64-pc-linux-gnu" => {
             common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
         }
         _ => Vec::new(),