This is to allow testing object stats collection.

No-try: true
Bug: v8:7760
Change-Id: I1e5318f18bfb3799b90c0ee0aec6df87a794b32c
Reviewed-on: https://chromium-review.googlesource.com/1065478
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53274}