Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/67604e1..792a87c

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clan/+log/1f92f99..30c5a8b

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

Review-Url: https://codereview.chromium.org/2393083006
Cr-Commit-Position: refs/heads/master@{#40065}