Rolling v8/tools/clang to 8598a726360f2722f4db0eab732a5f6b4cb41eb9

Rolling v8/tools/swarming_client to 71c61c858bb2c2deda83781978fe65e94171f58f

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

Review URL: https://codereview.chromium.org/1729263004

Cr-Commit-Position: refs/heads/master@{#34265}