Add support for Enums

test/codegen/fieldtest.dart

 // 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.
 
 library fieldtest;
 
 class A {
   int x = 42;
 }
 
@@ skipping 46 matching lines @@
   static const b = c + 3;
   static const d = 4;
 }
 class StaticFieldOrder2 {
   static const a = StaticFieldOrder2.b + 1;
   static const c = StaticFieldOrder2.d + 2;
   static const b = StaticFieldOrder2.c + 3;
   static const d = 4;
 }
 
+enum MyEnum { Val1, Val2, Val3, Val4 }
+
 void main() {
   var a = new A();
   foo(a);
   bar(a);
   print(baz(a));
 
   print(new Generic<String>().foo(' world'));
+
+  print(MyEnum.values);
 }