Support bounded mixins in the VM (fix issue 14453).

tests/language/mixin_mixin_bound_test.dart

Index: tests/language/mixin_mixin_bound_test.dart
===================================================================
--- tests/language/mixin_mixin_bound_test.dart	(revision 0)
+++ tests/language/mixin_mixin_bound_test.dart	(revision 0)
@@ -0,0 +1,29 @@
+// Copyright (c) 2014, 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 I<T> { }
+
+class J<T> { }
+
+class S<U extends Set<V>, V> { }
+
+class M<U, V, T extends Map<U, V>> {
+  t() { return T; }
+}
+
+class A<U, V extends List> = Object with M<U, V, Map<U, V>> implements I<V>;
+
+class C<T, K> = S<Set<T>, T> with A<T, List<K>> implements J<K>;
+
+main() {
+  var c = new C<int, bool>();
+  Expect.equals("Map<int, List<bool>>", c.t().toString());
+  Expect.isTrue(c is I<List<bool>>);
+  Expect.isTrue(c is J<bool>);
+  Expect.isTrue(c is S<Set<int>, int>);
+  Expect.isTrue(c is A<int, List<bool>>);
+  Expect.isTrue(c is M<int, List<bool>, Map<int, List<bool>>>);
+}