[rwx][mac] Enable fast W^X on Apple Silicon (M1)

Bug: v8:12797
Change-Id: I53bb803dd77db5bdd42b1a1b4b568e63857adf31
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3598861Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80396}

src/common/globals.h

@@ -188,8 +188,7 @@ using CodeT = Code;
 //
 #if V8_HAS_PTHREAD_JIT_WRITE_PROTECT && \
     !(defined(V8_COMPRESS_POINTERS) && !defined(V8_EXTERNAL_CODE_SPACE))
-// TODO(v8:12797): enable fast W^X permissions switching on Apple Silicon.
-#define V8_HEAP_USE_PTHREAD_JIT_WRITE_PROTECT false
+#define V8_HEAP_USE_PTHREAD_JIT_WRITE_PROTECT true
 #else
 #define V8_HEAP_USE_PTHREAD_JIT_WRITE_PROTECT false
 #endif