Did only work with full MCs. Since the majority of GCs is now
incremental and will be concurrent in future this becomes obsolete.

Bug: v8:6569
Change-Id: I28280a71dd4e779742dd4d1b3dd01087cd4f8fe0
Reviewed-on: https://chromium-review.googlesource.com/558983Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46399}