We don't need to iterate all heap objects here since we are only
interested in builtins.

Bug: v8:11641
Change-Id: Ib5b959010ad82b6fe50991f85a93d165030bd804
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2857962
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74271}