It's necessary to support fast W^X permission switching on MacOS on
ARM64 ("Apple M1"/Apple Silicon) where permission modification of RWX
pages to anything else is prohibited.

On all the other architectures/platforms RecommitPages() is equivalent
to SetPermissions().

The new API will be used in a follow-up CLs.

Bug: v8:12797
Change-Id: Id0d8b8c42c81b80cd8fa6b47c227680d7d1f9b10
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3606231Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Samuel Groß <saelo@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80190}