Rolling v8/tools/clang to 204eee93d4ffbc01d6182e4c199960db763c7dbc

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org
BUG=chromium:645953

Review-Url: https://codereview.chromium.org/2357163005
Cr-Commit-Position: refs/heads/master@{#39640}