Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/5718716..6167734

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/509676b..bd3b137

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

Change-Id: I70c12249d7946044d7049f5cf03357c5a2d1fbaf
Reviewed-on: https://chromium-review.googlesource.com/780865Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49515}