Allow "dynamic" as a constant value in analyzer.

tests/language/const_dynamic_type_literal_test.dart

Index: tests/language/const_dynamic_type_literal_test.dart
diff --git a/tests/language/const_dynamic_type_literal_test.dart b/tests/language/const_dynamic_type_literal_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a1be0f344209091857ac799ec01d4cb2e3ca1fa9
--- /dev/null
+++ b/tests/language/const_dynamic_type_literal_test.dart
@@ -0,0 +1,17 @@
+// Copyright (c) 2015, 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.
+
+// Test that 'dynamic' can be used in const expressions and has the expected
+// behavior.
+
+import "package:expect/expect.dart";
+
+const d = dynamic;
+const i = int;
+
+void main() {
+  Expect.isTrue(identical(d, dynamic)); /// 01: ok
+  Expect.equals(1, const { d: 1, d: 2 }.length); /// 02: static type warning
+  Expect.equals(2, const { d: 1, i: 2 }.length); /// 03: ok
+}