Rolling v8/tools/clang to 908392433b14b2ffe86bd1c791531816a65b7378

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

Review URL: https://codereview.chromium.org/1593213002

Cr-Commit-Position: refs/heads/master@{#33348}