Exclude RCTBridge RCTGetModuleClasses() when LEGACY_ARCH is COMPILED OUT (#56101)

Summary:
Pull Request resolved: #56101

Changelog: [Internal]

Reviewed By: javache

Differential Revision: D96615034

fbshipit-source-id: f6ee3cd33859bb904b383fb87d364319850298ea

Author: christophpurrer

packages/react-native/React/Base/RCTBridge.mm

@@ -35,11 +35,15 @@
 static dispatch_queue_t RCTModuleClassesSyncQueue;
 NSArray<Class> *RCTGetModuleClasses(void)
 {
+#ifndef RCT_REMOVE_LEGACY_ARCH
   __block NSArray<Class> *result;
   dispatch_sync(RCTModuleClassesSyncQueue, ^{
     result = [RCTModuleClasses copy];
   });
   return result;
+#else
+  return @[];
+#endif
 }
 
 NSSet<NSString *> *getCoreModuleClasses(void);