R=titzer@chromium.org

Bug: v8:7581
Change-Id: I66bf50bc1243cb5e4b9f2693febf91f74077a2f4
Reviewed-on: https://chromium-review.googlesource.com/978002Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52176}