R=titzer@chromium.org, hablich@chromium.org

Bug: v8:6600, chromium:787421
Change-Id: Ia8ae56ddef3b27b0721d5a66ff19abe098a2c6ca
Reviewed-on: https://chromium-review.googlesource.com/1109899Reviewed-by: Ben Titzer <titzer@chromium.org>
Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53965}