[toolchain-utils] Space ARM rotating builds more evenly.

This CL reorders the rotating builders to space the ARM
builds out more evenly, and also adds more data about
each board being built.

BUG=None
TEST=None

Change-Id: Icf158a28b4b41689ec6031e8be37c537d5836dd8
Reviewed-on: https://chrome-internal-review.googlesource.com/308295
Commit-Ready: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Reviewed-by: Yunlian Jiang <yunlian@google.com>
diff --git a/buildbot_test_llvm.py b/buildbot_test_llvm.py
index 3923bb0..a68abd8 100755
--- a/buildbot_test_llvm.py
+++ b/buildbot_test_llvm.py
@@ -34,16 +34,16 @@
 START_DATE = datetime.date(2016, 1, 1)
 TEST_PER_DAY = 2
 TEST_BOARD = [
-    'squawks',
-    'terra',
-    'lulu',
-    'peach_pit',
-    'peppy',
-    'link',
-    'sentry',
-    'chell',
-    'nyan_big',
-    'daisy',
+    'squawks',      # x86_64, rambi  (baytrail)
+    'terra',        # x86_64, strago (braswell)
+    'lulu',         # x86_64, auron  (broadwell)
+    'peach_pit',    # arm,    peach  (exynos-5420)
+    'peppy',        # x86_64, slippy (haswell celeron)
+    'link',         # x86_64, ivybridge (ivybridge)
+    'nyan_big',     # arm,    nyan   (tegra)
+    'sentry',       # x86_64, kunimitsu (skylake-u)
+    'chell',        # x86_64, glados (skylake-y)
+    'daisy',        # arm,    daisy  (exynos)
 ]