Rolling v8/tools/clang to f1ac92b46273db6ba0286cc1fe214d1aaa788f6d

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

Review URL: https://codereview.chromium.org/1466073003

Cr-Commit-Position: refs/heads/master@{#32158}