.. when concurrent-inlining, use direct reads instead.

Two fields were changed to have a non-atomic getter and acq-rel
accessors:

- Map::prototype_info
- PrototypeInfo::object_create_map

Bug: v8:7790
Change-Id: I05e888240d73ab6e961b1048a25713ec45fb0305
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2876852Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74777}