Now hopefully getting it right, but still leaving in the confusing
flag implications.

Bug: v8:6520,chromium:766162
Change-Id: Idc6dca012bf0c9777b4a75cf424410ce5914c885
Reviewed-on: https://chromium-review.googlesource.com/671022Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48082}