Add mirror tests for generic interfaces. Add base-language test for malbounded interfaces.

tests/language/malbounded_instantiation_test.dart

+// Copyright (c) 2013, 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 Super<T extends num> {}
+class Malbounded1 implements Super<String> {}  /// 01: static type warning
+class Malbounded2 extends Super<String> {}  /// 02: static type warning
+
+main() {
+  new Malbounded1();  /// 01: dynamic type error
+  new Malbounded2();  /// 02: dynamic type error
+  new Super<String>();  /// 03: static type warning, dynamic type error
+}