Fix super noSuchMethod handling.

tests/language/issue_25671b_test.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:expect/expect.dart';
+
+class A {
+  noSuchMethod() {                                    /// 01: static type warning
+    throw new Exception(                              /// 01: continued
+        "Wrong noSuchMethod() should not be called"); /// 01: continued
+  }                                                   /// 01: continued
+}
+class C extends Object with A {
+  test() {
+    super.v = 1; /// 01: continued
+  }
+}
+main() {
+  C c = new C();
+  Expect.throws(() => c.test(), (e) => e is NoSuchMethodError); /// 01: continued
+}