Remove ConstantExpression.value

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart

 // Copyright (c) 2014, 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 tree_ir_nodes;
 
 import '../constants/expressions.dart';
 import '../constants/values.dart' as values;
 import '../dart_types.dart' show DartType, InterfaceType, TypeVariableType;
 import '../elements/elements.dart';
@@ skipping 251 matching lines @@
   accept1(ExpressionVisitor1 visitor, arg) {
     return visitor.visitConcatenateStrings(this, arg);
   }
 }
 
 /**
  * A constant.
  */
 class Constant extends Expression {
   final ConstantExpression expression;
+  final values.ConstantValue value;
 
-  Constant(this.expression);
+  Constant(this.expression, this.value);
 
   Constant.bool(values.BoolConstantValue constantValue)
       : expression = new BoolConstantExpression(
-          constantValue.primitiveValue, constantValue);
+          constantValue.primitiveValue),
+        value = constantValue;
 
   accept(ExpressionVisitor visitor) => visitor.visitConstant(this);
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitConstant(this, arg);
-
-  values.ConstantValue get value => expression.value;
 }
 
 class This extends Expression {
   accept(ExpressionVisitor visitor) => visitor.visitThis(this);
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitThis(this, arg);
 }
 
 class LiteralList extends Expression {
   final InterfaceType type;
   final List<Expression> values;
@@ skipping 898 matching lines @@
   visitTypeExpression(TypeExpression node) {
     _replaceExpressions(node.arguments);
     return node;
   }
 
   visitCreateInvocationMirror(CreateInvocationMirror node) {
     _replaceExpressions(node.arguments);
     return node;
   }
 }