Revert D96615034 (#56132)

Summary:
Pull Request resolved: #56132

Changelog: [Internal]

Fixes a regression introduced in #56101

Reviewed By: shwanton

Differential Revision: D97115601

fbshipit-source-id: 7bb08f95ee7a698a66d3f266ddfabf506ce5794a

Author: generatedunixname89002005232357

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

@@ -35,15 +35,11 @@
 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);