Rolling v8/build to a767a79305018c5ec5affd7d96cff474aa3b03a1

Rolling v8/tools/clang to 052b1cffaca49a038f27168ef9d897db6df04e5a

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

Review-Url: https://codereview.chromium.org/2311503003
Cr-Commit-Position: refs/heads/master@{#39144}