Rolling v8/buildtools to fee7f1e849f59c3fd7bb7b2cacf876edca0572f3

Rolling v8/tools/clang to c745f4763a6af65800a40b6da508f3e943d1804e

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

Review URL: https://codereview.chromium.org/1540513002

Cr-Commit-Position: refs/heads/master@{#32961}