R=ahaas@chromium.org, bmeurer@chromium.org

Bug: v8:6048
Change-Id: I5641cb1036fb0c6bf0803de3df9ddeb5787a93de
Reviewed-on: https://chromium-review.googlesource.com/563308Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46593}