Refactor ConstantExpression/ConstantConstructor to use entities.

pkg/compiler/lib/src/use_unused_api.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.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 86 matching lines @@
 }
 
 void useConstant(
     [constants.ConstantValue constant,
     constants.ConstantExpression expression,
     constants.ConstructedConstantExpression constructedConstant,
     constants.ConstantSystem cs,
     constants.Environment env]) {
   constant.isObject;
   cs.isBool(constant);
-  constructedConstant.computeInstanceType();
-  constructedConstant.computeInstanceFields();
+  constructedConstant.computeInstanceType(null);
+  constructedConstant.computeInstanceFields(null);
   expression.evaluate(null, null);
   new NullConstantConstructorVisitor()
     ..visit(null, null)
     ..visitGenerative(null, null)
     ..visitRedirectingFactory(null, null)
     ..visitRedirectingGenerative(null, null);
 }
 
 void useNode(tree.Node node) {
   node
@@ skipping 190 matching lines @@
   operators.UnaryOperator.fromKind(null);
   operators.BinaryOperator.fromKind(null);
   new semantic_visitor.BulkSendVisitor()..apply(null, null);
   new semantic_visitor.TraversalVisitor(null).apply(null, null);
   new semantic_visitor.BulkDeclarationVisitor().apply(null, null);
 }
 
 useDeferred([deferred.DeferredLoadTask task]) {
   task.dump();
 }