BUG=v8:6409

Change-Id: I9e06388c683e283a1922fb436dceb244f5093042
Reviewed-on: https://chromium-review.googlesource.com/664857Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47993}