Rolling v8/buildtools to cf8c4332f5c9d0da4b4782d7f0122df74a16819b

Rolling v8/tools/clang to e47364ad9fb37e8255a7a5cdf7891781b3f8256e

Rolling v8/tools/swarming_client to 0b908f18767c8304dc089454bc1c91755d21f1f5

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

Review URL: https://codereview.chromium.org/1621563002

Cr-Commit-Position: refs/heads/master@{#33451}