R=gdeepti@chromium.org,bbudge@chromium.org,clemensh@chromium.org,titzer@chromium.org
BUG=v8:6020

Change-Id: I9d307a70d44504dc0e84e3e09d48bcc9b9542462
Reviewed-on: https://chromium-review.googlesource.com/1071095
Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53375}