Re-apply "Implement operator== and hashCode for bound closures."

tests/utils/dummy_compiler_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.
 
 // Smoke test of the dart2js compiler API.
 library dummy_compiler;
 
 import 'dart:async';
 
 import '../../sdk/lib/_internal/compiler/compiler.dart';
@@ skipping 11 matching lines @@
                   class Type {}
                   class bool {}
                   class num {}
                   class int {}
                   class double{}
                   class String{}
                   class Function{}
                   class List {}
                   class Map {}
                   class Closure {}
+                  class BoundClosure {}
                   class Dynamic_ {}
                   class Null {}
                   class StackTrace {}
                   class LinkedHashMap {}
                   identical(a, b) => true;
                   getRuntimeTypeInfo(o) {}
                   setRuntimeTypeInfo(o, i) {}
                   eqNull(a) {}
                   eqNullB(a) {}""";
     } else if (uri.path.endsWith('_patch.dart')) {
@@ skipping 56 matching lines @@
               new Uri(scheme: 'package', path: '/'),
               provider, handler);
   result.then((String code) {
     if (code == null) {
       throw 'Compilation failed';
     }
   }, onError: (e) {
       throw 'Compilation failed';
   });
 }