fix(compiler): support referencing enums in namespaces (#20947)

Due to an overly agressive assert the compiler would generate
an internal error when referencing an enum declared in
namspace.

Fixes #18170

PR Close #20947

packages/compiler/test/aot/summary_resolver_spec.ts

@@ -95,6 +95,15 @@ export function main() {
            expect(host.isSourceFile).toHaveBeenCalledWith('someFile.ts');
          });
     });
+
+    describe('regression', () => {
+      // #18170
+      it('should support resolving symbol with members ', () => {
+        init();
+        expect(summaryResolver.resolveSummary(symbolCache.get('/src.d.ts', 'Src', ['One', 'Two'])))
+            .toBeNull();
+      });
+    });
   });
 }