Rolling v8/tools/clang to 667833c8778efe12d3d749f5f5dfd4b10a1388a0

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

Review URL: https://codereview.chromium.org/1651003002

Cr-Commit-Position: refs/heads/master@{#33626}