R=titzer@chromium.org

Bug: v8:6600
Change-Id: Ib926c068b468df6fcbaab9ef4734e9cd90ba553c
Reviewed-on: https://chromium-review.googlesource.com/c/1309814Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57167}