Roll clang 351477:352138.

Ran `tools/clang/scripts/upload_revision.py 352138`.

Bug: 924185
Change-Id: I54d3c8fe506198fb3acab9b63187a7d15ee0d433
Reviewed-on: https://chromium-review.googlesource.com/c/1436036Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626092}

tools/clang/scripts/update.py

@@ -27,7 +27,7 @@ import zipfile
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://chromium.googlesource.com/chromium/src/+/master/docs/updating_clang.md
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION = '351477'
+CLANG_REVISION = '352138'
 
 use_head_revision = bool(os.environ.get('LLVM_FORCE_HEAD_REVISION', '0')
                          in ('1', 'YES'))