Add substitutions even when type arguments are fixed.

tests/language/function_subtype_bound_closure5a_test.dart

Index: tests/language/function_subtype_bound_closure5a_test.dart
diff --git a/tests/language/function_subtype_bound_closure5_test.dart b/tests/language/function_subtype_bound_closure5a_test.dart
similarity index 96%
copy from tests/language/function_subtype_bound_closure5_test.dart
copy to tests/language/function_subtype_bound_closure5a_test.dart
index 8192b6f9436623ab708ce44e13fe7c24657017c0..106f113d62723948c33ac927e98c7055e5602b6b 100644
--- a/tests/language/function_subtype_bound_closure5_test.dart
+++ b/tests/language/function_subtype_bound_closure5a_test.dart
@@ -33,7 +33,9 @@ class C<T> {
   }
 }
 
-class D<S, T> extends C<T> {}
+class Cm<T> extends C<T> {}
+
+class D<S, T> extends Cm<T> {}
 
 main() {
   new D<String, bool>().test('bool', true);