R=rmcilroy@chromium.org
BUG=v8:6408

Change-Id: I724a14e4f3b9395eed5d56ec3b5f7be835e9390a
Reviewed-on: https://chromium-review.googlesource.com/539595Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46009}