R=titzer@chromium.org
BUG=v8:6876

Change-Id: Ib9821123e89b4a198cfa921ffd4cf5bee55cc93d
Reviewed-on: https://chromium-review.googlesource.com/856999Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50498}