R=ahaas@chromium.org, jarin@chromium.org

Bug: v8:6770
Change-Id: Iebf4dc9f2dd75079c5362e02d859c48e2113cf20
Reviewed-on: https://chromium-review.googlesource.com/643067Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47780}