R=ahaas@chromium.org

Bug: v8:9429, v8:9396
Change-Id: If26b9a480261c1625b6844b05de5323648ab34b6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1687544Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62625}