Make continuations last in CPS IR constructors.

pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.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_builder_task;
 
 import '../closure.dart' as closurelib;
 import '../closure.dart' hide ClosureScope;
 import '../constants/expressions.dart';
 import '../dart_types.dart';
@@ skipping 609 matching lines @@
   ir.Primitive visitCascadeReceiver(ast.CascadeReceiver node) {
     assert(irBuilder.isOpen);
     return _currentCascadeReceiver = visit(node.expression);
   }
 
   ir.Primitive visitCascade(ast.Cascade node) {
     assert(irBuilder.isOpen);
     var oldCascadeReceiver = _currentCascadeReceiver;
     // Throw away the result of visiting the expression.
     // Instead we return the result of visiting the CascadeReceiver.
-    this.visit(node.expression);
+    visit(node.expression);
     ir.Primitive receiver = _currentCascadeReceiver;
     _currentCascadeReceiver = oldCascadeReceiver;
     return receiver;
   }
 
   // ## Sends ##
   @override
   ir.Primitive visitAssert(ast.Send node, ast.Node condition, _) {
     assert(irBuilder.isOpen);
     if (compiler.enableUserAssertions) {
@@ skipping 2114 matching lines @@
   SourceInformation buildCall(ast.Node node) {
     return new PositionSourceInformation(
         new TokenSourceLocation(sourceFile, node.getBeginToken(), name));
   }
 
   @override
   SourceInformationBuilder forContext(AstElement element) {
     return new PositionSourceInformationBuilder(element);
   }
 }