R=binji@chromium.org

Change-Id: I936d906be90c0c6d3b84b5ad4e8cb574ab8cd970
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1585851
Commit-Queue: Ben Titzer <titzer@chromium.org>
Reviewed-by: Ben Smith <binji@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61135}