more.

Bug: v8:6333, v8:6921
Change-Id: I442190988f2c853560b28efa54e04ff73f9d94ca
Reviewed-on: https://chromium-review.googlesource.com/718343
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49111}