This is a reland of 1c0cca0f. It is
modified now to use V8_HAS_PTHREAD_JIT_WRITE_PROTECT and is rebased on
https://crrev.com/c/3085271 which fixes the definition of that macro.

Original change's description:
> Reland: [wasm] Check correctness of thread-local write protection
>
> The fix landed as a separate CL: https://crrev.com/c/3081522
> This is an unmodified reland.
>
> Original description:
> We make an undocumented assumption in {CodeSpaceWriteScope} that a
> single thread will only work on one module at a time. If this is
> violated, the thread-local {code_space_write_nesting_level_} would
> prevent the second module from being switched to writable.
>
> This CL adds a second thread local (in debug only) to check that if
> there is already a {CodeSpaceWriteScope} open that it contains the same
> {NativeModule} as any nested scope.
>
> R=jkummerow@chromium.org
>
> Bug: v8:11974
> Cq-Include-Trybots: luci.v8.try:v8_linux_gc_stress_dbg_ng
> Cq-Include-Trybots: luci.v8.try:v8_mac64_gc_stress_dbg_ng
> Change-Id: Id827b6ca472f695e4500584349aba159aa07eed1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3080578
> Commit-Queue: Clemens Backes <clemensb@chromium.org>
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#76177}

Bug: v8:11974
Change-Id: Iffc510e85c8c56f26bfa88115ed3a8bdd33ef422
Cq-Include-Trybots: luci.v8.try:v8_linux_gc_stress_dbg_ng
Cq-Include-Trybots: luci.v8.try:v8_mac64_gc_stress_dbg_ng
Cq-Include-Trybots: luci.v8.try:v8_mac_arm64_rel_ng
Cq-Include-Trybots: luci.v8.try:v8_mac_arm64_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3085269Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76235}