R=titzer@chromium.org

Bug: v8:7581
Change-Id: I153b09ac1676c75590f37c4b7d1f8659c37bbe96
Reviewed-on: https://chromium-review.googlesource.com/c/1421837
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59029}