R=littledan@chromium.org, adamk@chromium.org

Bug: v8:5244
Change-Id: I1186601bc05bd5348acb4b0e1242d7d074020ad9
Reviewed-on: https://chromium-review.googlesource.com/757564Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Commit-Queue: Josh Wolfe <jwolfe@igalia.com>
Cr-Commit-Position: refs/heads/master@{#49308}