Rolling v8/build to 143dcc2b1b07c16858f16f25fefe04311f663279

Rolling v8/tools/clang to 18b63c680a59a7125514b1e05ca42cdfb89a19c7

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

Review-Url: https://codereview.chromium.org/1959293002
Cr-Commit-Position: refs/heads/master@{#36120}