Rolling v8/tools/clang to 66f5328417331216569e8beb244fd887f62e8997

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

Review URL: https://codereview.chromium.org/1403423006

Cr-Commit-Position: refs/heads/master@{#31536}