Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/f2ca3e0..509676b

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

Change-Id: I5d6e78e23d83234c8c80eaef4a7c8a51c7575e6a
Reviewed-on: https://chromium-review.googlesource.com/777929Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49467}