R=petermarshall@chromium.org

Bug: v8:6687
Change-Id: Ic447a6cd5cb8a7a251b4820fc82f1f1d033be355
Reviewed-on: https://chromium-review.googlesource.com/612067Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47340}