R=rmcilroy@chromium.org

Bug: v8:9247
Change-Id: I2644436fd44ecf0e206a81cf28071cccb49793df
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1635690
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61936}