Rename Constant to ConstantValue and ConstExp to ConstantExpression.

sdk/lib/_internal/compiler/implementation/dart_backend/logical_rewriter.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 logical_rewriter;
 
 import '../constants/values.dart' as values;
 import 'tree_ir_nodes.dart';
 
 /// Rewrites logical expressions to be more compact in the Tree IR.
@@ skipping 390 matching lines @@
       if (e.thenExpression is Not && e.elseExpression is Not && liftNots) {
         e.thenExpression = (e.thenExpression as Not).operand;
         e.elseExpression = (e.elseExpression as Not).operand;
         return new Not(e);
       }
       return e;
     }
     if (e is Constant && e.value.isBool) {
       // !true ==> false
       if (!polarity) {
-        values.BoolConstant value = e.value;
+        values.BoolConstantValue value = e.value;
         return new Constant.primitive(value.negate());
       }
       return e;
     }
     e = visitExpression(e);
     return polarity ? e : new Not(e);
   }
 
   bool isTrue(Expression e) {
     return e is Constant && e.value.isTrue;
@@ skipping 20 matching lines @@
   }
 
   /// Destructively updates each entry of [l] with the result of visiting it.
   void _rewriteList(List<Expression> l) {
     for (int i = 0; i < l.length; i++) {
       l[i] = visitExpression(l[i]);
     }
   }
 }