Rolling v8/tools/clang to 7a1ebdd9ae15490c88e87bf9b34417c318fe1986

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

Review URL: https://codereview.chromium.org/1702543002

Cr-Commit-Position: refs/heads/master@{#34010}