Store constant variable initializers in elements.

pkg/compiler/lib/src/typechecker.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 dart2js.typechecker;
 
 import 'common/names.dart' show Identifiers;
 import 'common/resolution.dart' show Resolution;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
@@ skipping 1935 matching lines @@
       analyze(switchCase);
     }
 
     if (!hasDefaultCase && expressionType.isEnumType) {
       compiler.enqueuer.resolution.addDeferredAction(executableContext, () {
         Map<ConstantValue, FieldElement> enumValues =
             <ConstantValue, FieldElement>{};
         List<FieldElement> unreferencedFields = <FieldElement>[];
         EnumClassElement enumClass = expressionType.element;
         enumClass.enumValues.forEach((EnumConstantElement field) {
-          ConstantValue constantValue =
-              compiler.constants.getConstantValueForVariable(field);
+          // TODO(johnniwinther): Ensure that the enum constant is computed at
+          // this point.
+          ConstantValue constantValue = compiler.resolver.constantCompiler
+              .getConstantValueForVariable(field);
           if (constantValue == null) {
             // The field might not have been resolved.
             unreferencedFields.add(field);
           } else {
             enumValues[constantValue] = field;
           }
         });
 
         for (SwitchCase switchCase in node.cases) {
           for (Node labelOrCase in switchCase.labelsAndCases) {
@@ skipping 42 matching lines @@
 
   visitTypedef(Typedef node) {
     // Do not typecheck [Typedef] nodes.
   }
 
   visitNode(Node node) {
     reporter.internalError(node,
         'Unexpected node ${node.getObjectDescription()} in the type checker.');
   }
 }