R=titzer@chromium.org

Bug: v8:7754
Change-Id: I6f86d8d835009d864ba059055ee5bade4a52ab2e
Reviewed-on: https://chromium-review.googlesource.com/1109917Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53927}