BUG=v8:6243

Change-Id: Ia6dfa407591d1b06d5b014627bb44413540aecb3
Reviewed-on: https://chromium-review.googlesource.com/516984Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45542}