Attach type info to extension method and object method tear-offs

test/codegen/methods.dart

 // Copyright (c) 2015, 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 methods;
 
 class A {
   int x() => 42;
 
   int y(int a) {
@@ skipping 37 matching lines @@
   var f = new Foo();
   f.bar("Bar's call method!");
 
   // Tear-off
   A a = new A();
   var g = a.x;
 
   // Dynamic Tear-off
   dynamic aa = new A();
   var h = aa.x;
+
+  // Tear-off of object methods
+  var ts = a.toString;
+  var nsm = a.noSuchMethod;
+
+  // Tear-off extension methods
+  var c = "".padLeft;
+  var r = (3.0).floor;
 }