Rolling v8/tools/clang to b194e7fa21cc99980e38ff8b29740e78134fcfce

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

Review URL: https://codereview.chromium.org/1712993002

Cr-Commit-Position: refs/heads/master@{#34133}