It is expected that changing page permissions can fail due to the system
running out of memory. However, any other failure is unexpected and
likely indicates a bug in the caller, such as changing the permissions
of an invalid memory region. To allow distinguishing between these
unexpected failures and expected OOM failures, this CL adds CHECKs into
the low-level memory management routines to abort when an unexpected
failure occurs.

Similar logic could later be added to other low-level memory management
routines that can legitimately fail due to OOM as well.

Bug: chromium:1320126
Change-Id: I3de6f4b2aed8962c91770b81382df34384584501
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3610445
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80245}