Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/b6fe934..0a9737b

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: I85267bc7ecb1fc6cb53cfd761f414147b3d47d73
Reviewed-on: https://chromium-review.googlesource.com/958684Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51865}