Invoking constructors in js cps

tests/compiler/dart2js/js_backend_cps_ir_basic.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.
 
 // Tests for basic functionality.
 
 library basic_tests;
 
 import 'js_backend_cps_ir_test.dart';
 
@@ skipping 56 matching lines @@
   """,
   """function() {
   return V.foo();
 }"""),
   const TestEntry("main() {}"),
   const TestEntry("main() { return 42; }"),
   const TestEntry("main() { return; }", """
 function() {
   return null;
 }"""),
+const TestEntry("""
+main() {
+  print(new Set());
+  print(new Set.from([1, 2, 3]));
+}""", r"""
+function() {
+  P.print(P.Set_Set());
+  P.print(P.Set_Set$from([1, 2, 3]));
+  return null;
+}"""),
 ];