R=titzer@chromium.org
BUG=v8:7549

Change-Id: I2b95a4d204dff6038b5a012b9753242f3384b886
Reviewed-on: https://chromium-review.googlesource.com/979811Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52215}