Fix needsNoSuchMethod computation for abstractly instantiated classes

tests/language/regress_28255_test.dart

+// Copyright (c) 2017, 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.
+
+// Regression test for issue 28255
+
+import 'dart:mirrors';

[zra, 2017/01/05 16:02:02]

It looks like you need to SkipByDesign this test in product mode.

+import 'package:expect/expect.dart';
+
+class Class {
+  noSuchMethod(i) => true;
+
+  foo() {
+    var o = this;
+    Expect.isFalse(o.bar is Null);
+    Expect.isTrue(o.bar != null);
+    Expect.equals(true.runtimeType, o.bar.runtimeType);
+  }
+}
+
+main() {
+  reflectClass(Class).newInstance(const Symbol(''), []).reflectee.foo();
+}