Big merge from experimental to bleeding edge.

tests/compiler/dart2js_extra/type_argument_factory_crash_test.dart

 // Copyright (c) 2012, 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.
 
 // A regression test for a dart2js crash.
 
 void main() {
   // This constructor call causes a crash in dart2js.
   var o = new LinkedHashMap<int, int>();
 
   // Comment out this line, the compiler doesn't crash.
   Expect.isFalse(o is List<int>);
 
   // Enable these two lines, the compiler doesn't crash.
-  // Expect.isTrue(o.keys is List<int>);
-  // Expect.isFalse(o.keys is List<String>);
+  // Expect.isTrue(o.keys is Iterable<int>);
+  // Expect.isFalse(o.keys is Iterable<String>);
 }