Big merge from experimental to bleeding edge.

tests/compiler/dart2js_extra/list_factory_test.dart

 // Copyright (c) 2011, 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.
 
 main() {
-  var a = new List(4);
+  var a = new List.fixedLength(4);
   Expect.equals(4, a.length);
   a[0] = 42;
   a[1] = 43;
   a[2] = 44;
   a[3] = 45;
   for (int i = 0; i < a.length; i++) {
     Expect.equals(42 + i, a[i]);
   }
 
   a = new List();
   a.add(42);
   a.add(43);
   a.add(44);
   a.add(45);
   Expect.equals(4, a.length);
   for (int i = 0; i < a.length; i++) {
     Expect.equals(42 + i, a[i]);
   }
 }