Rolling v8/buildtools to be55b9ad86a4a5f760895984f93f76038e08e29e

Rolling v8/tools/clang to 2b2edb2dbbc5818f98972eeefd756cdcd69aa6f3

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

Review URL: https://codereview.chromium.org/1650463002

Cr-Commit-Position: refs/heads/master@{#33598}