Rolling v8/tools/clang to 71b766acbd4f2dbe860bcb57c003eba006244ae9

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

Review URL: https://codereview.chromium.org/1468333002

Cr-Commit-Position: refs/heads/master@{#32190}