POSIX_COMMIT_CHECKS adding for apple. (#284)

* POSIX_COMMIT_CHECKS adding for apple Intel

src/pal/pal_apple.h

@@ -52,6 +52,7 @@ namespace snmalloc
         ::bzero(p, size);
     }
 
+#  if defined(PLATFORM_IS_ARM)
     /**
      * Overriding here to mark the page as reusable
      * rolling it as much as necessary.
@@ -63,6 +64,9 @@ namespace snmalloc
     static void notify_not_using(void* p, size_t size) noexcept
     {
       SNMALLOC_ASSERT(is_aligned_block<PALBSD::page_size>(p, size));
+#    ifdef USE_POSIX_COMMIT_CHECKS
+      memset(p, 0x5a, size);
+#    endif
       while (madvise(p, size, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN)
         ;
     }
@@ -82,6 +86,7 @@ namespace snmalloc
       if constexpr (zero_mem == YesZero)
         zero<true>(p, size);
     }
+#  endif
   };
 } // namespace snmalloc
 #endif