R=ahaas@chromium.org

Bug: v8:9429, v8:9396
Change-Id: I79e5d707f6c3970c96eb2186604d8b26fda787e5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1687897Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62556}