cppgc: Assumption of stack location doesn't hold on Mac

Bug: v8:12067
Change-Id: I69cfde8aa37c687cd1daffffc54e6de166ea65dc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3085277
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76205}

include/cppgc/platform.h

@@ -153,11 +153,11 @@ V8_EXPORT void Abort();
 
 // static
 constexpr bool Platform::StackAddressesSmallerThanHeapAddresses() {
-#if V8_OS_WIN || V8_OS_FUCHSIA
+#if V8_OS_WIN || V8_OS_FUCHSIA || V8_OS_MACOSX
   return false;
 #else
   return true;
-#endif  // V8_OS_WIN || V8_OS_FUCHSIA
+#endif  // V8_OS_WIN || V8_OS_FUCHSIA || V8_OS_MACOSX
 }
 
 }  // namespace cppgc