Make the three map's bitfields use release/acquire semantics. This
ensures, for example, that when we set the number of own descriptors on
the map we will do so with a release store.

Also, start reading and writing said bitfields concurrently when
concurrent inlining is enabled. Note the BIMODAL_ACCESSOR_WITH_FLAG_B
macro which enables this.

Bug: v8:7790
Change-Id: I16561d8e065c50ce272b085d9606b98e37922633
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2536640Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71237}