R=rmcilroy@chromium.org
BUG=v8:6409

Change-Id: Ib8bb85674f63fed47aa55a775eaade6b14d60f2e
Reviewed-on: https://chromium-review.googlesource.com/654040Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47873}