R=ahaas@chromium.org

Bug: v8:8238, v8:7490
Change-Id: I27a57a43ad767d77e64764eda1d9017db87bdfcb
Reviewed-on: https://chromium-review.googlesource.com/c/1317588Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57237}