Rolling v8/tools/clang to 1cde9025c16dfc3e23be2db010b24f657c255b4c

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

Review URL: https://codereview.chromium.org/1359983006

Cr-Commit-Position: refs/heads/master@{#30896}