CodeSpaceMemoryModificationScope should only be used by the main
thread and during a safepoint. This adds a check in
CodeSpaceMemoryModificationScope.

The reason for this is that CodeSpaceMemoryModificationScope is not
thread-safe. It assumes that no other thread is modifying code space
(either by setting memory permission or adding a new page).

This CL also replaces CodeSpaceMemoryModificationScope to
CodePageCollectionMemoryModificationScope in a few occurrences, where
the former is not needed. This should not hurt performance.

Bug: v8:12054
Change-Id: I2675e667782c6ad8410877a4e64374899066bcd1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3263890
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77732}