Rolling v8/tools/clang to 50fc8b6e785aa002218d67b78db871b21b1c9d71

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

Review URL: https://codereview.chromium.org/1710263004

Cr-Commit-Position: refs/heads/master@{#34173}