Merge the work on Generic Types Reification from 'dart-lang/reify' repo

pkg/kernel/testcases/reify/is1_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.
+
+library is1_test;
+
+import 'test_base.dart';
+
+class N {}
+
+class I extends N {}
+
+class D extends N {}
+
+class A<T> {}
+
+main() {
+  var x = new A<I>();
+  expectTrue(x is A<N>);
+  expectTrue(x is A<I>);
+  expectFalse(x is A<D>);
+
+  var y = new A();
+  expectTrue(y is A<N>);
+  expectTrue(y is A<I>);
+  expectTrue(y is A<D>);
+}