Rolling v8/tools/clang to 865186d384b106af211dcfaf2ab3f4e778773098

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

Review URL: https://codereview.chromium.org/1474273002

Cr-Commit-Position: refs/heads/master@{#32355}