Restore of https://chromium-review.googlesource.com/c/v8/v8/+/2194012.
I changed it to be non-atomic and missed the fact that the concurrent
marker accesses the has_prototype_slot concurrently.

Bug: v8:7790, v8:11353
Change-Id: I292aeacb340b6340c40b633db2591c7d0cbca3bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2772608Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73531}