Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/506800f..1fd2d08

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

Change-Id: I1461e1e9c839a717d307eb51b79f49ecf4f45616
Reviewed-on: https://chromium-review.googlesource.com/1046246
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53011}