R=machenback@chromium.org

Bug: v8:6565
Change-Id: I57bf7deb926e2b2b0623d8f2a65693df4639aaa2
Reviewed-on: https://chromium-review.googlesource.com/560092Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46423}