Update elements, nodes and visitors for serialization.

pkg/compiler/lib/src/elements/elements.dart

 // Copyright (c) 2012, 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 elements;
 
 import '../common.dart';
 import '../common/resolution.dart' show Resolution;
 import '../compiler.dart' show Compiler;
 import '../constants/constructors.dart';
@@ skipping 1475 matching lines @@
 }
 
 abstract class MixinApplicationElement extends ClassElement {
   ClassElement get mixin;
   InterfaceType get mixinType;
 }
 
 /// Enum declaration.
 abstract class EnumClassElement extends ClassElement {
   /// The static fields implied by the enum values.
-  List<FieldElement> get enumValues;
+  List<EnumConstantElement> get enumValues;
+}
+
+/// An enum constant value.
+abstract class EnumConstantElement extends FieldElement {
+  /// The enum that declared this constant.
+  EnumClassElement get enclosingClass;
+
+  /// The index of this constant within the values of the enum.
+  int get index;
 }
 
 /// The label entity defined by a labeled statement.
 abstract class LabelDefinition extends Entity {
   Label get label;
   String get labelName;
   JumpTarget get target;
 
   bool get isTarget;
   bool get isBreakTarget;
@@ skipping 192 matching lines @@
   /// by a field.
   bool get isDeclaredByField;
 
   /// Returns `true` if this member is abstract.
   bool get isAbstract;
 
   /// If abstract, [implementation] points to the overridden concrete member,
   /// if any. Otherwise [implementation] points to the member itself.
   Member get implementation;
 }