cps-ir: Handle factories and redirecting constructors with JS backend.

tests/compiler/dart2js/js_backend_cps_ir_basic_test.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.
 // VMOptions=-DUSE_CPS_IR=true
 
 // Tests for basic functionality.
 
 library basic_tests;
 
 import 'js_backend_cps_ir.dart';
@@ skipping 89 matching lines @@
 function() {
   return null;
 }"""),
   // Constructor invocation
   const TestEntry("""
 main() {
   print(new Set());
   print(new Set.from([1, 2, 3]));
 }""", r"""
 function() {
-  P.print(P.Set_Set(null));
-  P.print(P.Set_Set$from([1, 2, 3], null));
+  P.print(P.LinkedHashSet_LinkedHashSet(null));
+  P.print(P.LinkedHashSet_LinkedHashSet$from([1, 2, 3], null));
   return null;
 }"""),
   // Call synthetic constructor.
   const TestEntry("""
 class C {}
 main() {
   print(new C());
 }"""),
   // Method invocation
   const TestEntry("""
@@ skipping 61 matching lines @@
 function() {
   P.print("Done");
   return null;
 }""")
 ];
 
 
 void main() {
   runTests(tests);
 }