Remove ConstantExpression.value

pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart

 // Copyright (c) 2013, 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.ir_nodes;
 
 import '../constants/expressions.dart';
 import '../constants/values.dart' as values show ConstantValue;
 import '../dart_types.dart' show DartType, InterfaceType, TypeVariableType;
 import '../elements/elements.dart';
 import '../io/source_information.dart' show SourceInformation;
@@ skipping 652 matching lines @@
   final List<Reference<Primitive>> arguments;
 
   CreateInvocationMirror(this.selector, List<Primitive> arguments)
       : this.arguments = _referenceList(arguments);
 
   accept(Visitor visitor) => visitor.visitCreateInvocationMirror(this);
 }
 
 class Constant extends Primitive {
   final ConstantExpression expression;
+  final values.ConstantValue value;
 
-  Constant(this.expression);
-
-  values.ConstantValue get value => expression.value;
+  Constant(this.expression, this.value);
 
   accept(Visitor visitor) => visitor.visitConstant(this);
 }
 
 class LiteralList extends Primitive {
   /// The List type being created; this is not the type argument.
   final InterfaceType type;
   final List<Reference<Primitive>> values;
 
   LiteralList(this.type, List<Primitive> values)
@@ skipping 478 matching lines @@
     processNonTailThrow(node);
     processReference(node.value);
   }
 
   processCreateInvocationMirror(CreateInvocationMirror node) {}
   visitCreateInvocationMirror(CreateInvocationMirror node) {
     processCreateInvocationMirror(node);
     node.arguments.forEach(processReference);
   }
 }