Move continueWithExpression to IrBuilder.

sdk/lib/_internal/compiler/implementation/dart_backend/tree_ir_builder.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_builder;
 
 import '../dart2jslib.dart' as dart2js;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../cps_ir/cps_ir_nodes.dart' as cps_ir;
@@ skipping 328 matching lines @@
   }
 
   Statement visitDeclareFunction(cps_ir.DeclareFunction node) {
     Variable variable = getClosureVariable(node.variable);
     FunctionDefinition function = makeSubFunction(node.definition);
     return new FunctionDeclaration(variable, function, visit(node.body));
   }
 
   Statement visitTypeOperator(cps_ir.TypeOperator node) {
     Expression receiver = getVariableReference(node.receiver);
-    Expression concat = new TypeOperator(receiver, node.type, node.operator);
+    Expression concat =
+        new TypeOperator(receiver, node.type, isTypeTest: node.isTypeTest);
     return continueWithExpression(node.continuation, concat);
   }
 
   Statement visitInvokeConstructor(cps_ir.InvokeConstructor node) {
     List<Expression> arguments = translateArguments(node.arguments);
     Expression invoke =
         new InvokeConstructor(node.type, node.target, node.selector, arguments);
     return continueWithExpression(node.continuation, invoke);
   }
 
@@ skipping 107 matching lines @@
     // visited.
     compiler.internalError(compiler.currentElement, 'Unexpected IR node.');
     return null;
   }
 
   Expression visitIsTrue(cps_ir.IsTrue node) {
     return getVariableReference(node.value);
   }
 }