Add UBSan runtime to the Mac Clang package

Bug: 1022718
Change-Id: I4eca834414883ffac786d1f4310261b67929a8a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904175
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Reviewed-by: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714247}

tools/clang/scripts/package.py

@@ -238,6 +238,10 @@ def main():
       # Profile runtime (used by profiler and code coverage).
       'lib/clang/$V/lib/darwin/libclang_rt.profile_iossim.a',
       'lib/clang/$V/lib/darwin/libclang_rt.profile_osx.a',
+
+      # UndefinedBehaviorSanitizer runtime.
+      'lib/clang/$V/lib/darwin/libclang_rt.ubsan_iossim_dynamic.dylib',
+      'lib/clang/$V/lib/darwin/libclang_rt.ubsan_osx_dynamic.dylib',
     ])
   elif sys.platform.startswith('linux'):
     want.extend([

tools/clang/scripts/update.py

@@ -41,7 +41,7 @@ import zipfile
 # Reverting problematic clang rolls is safe, though.
 CLANG_REVISION = '64a362e7216a43e3ad44e50a89265e72aeb14294'
 CLANG_SVN_REVISION = '373424'
-CLANG_SUB_REVISION = 1
+CLANG_SUB_REVISION = 2
 
 PACKAGE_VERSION = '%s-%s-%s' % (CLANG_SVN_REVISION, CLANG_REVISION[:8],
                                 CLANG_SUB_REVISION)