Update kernel/visitor_test expectations

tests/compiler/dart2js/kernel/visitor_test.dart

 // Copyright (c) 2016, 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.
 
 /// Test that the dart2js copy of [KernelVisitor] generates the expected IR as
 /// defined by kernel spec-mode test files.
 
 import 'dart:io';
 import 'dart:async';
 import 'package:compiler/src/compiler.dart' show Compiler;
@@ skipping 12 matching lines @@
 const String TESTCASE_DIR = 'pkg/front_end/testcases/';
 
 const List<String> TESTS = const <String>[
   'DeltaBlue',
   'argument',
   'arithmetic',
   'async_function',
   'bad_store',
   'call',
   'closure',
-  'covariant_generic',
+  // 'covariant_generic', Issue 29853: typedefs
   'escape',
   'fallthrough',
   'micro',
   'named_parameters',
   'null_aware',
-  'optional',
+  // 'optional', Issue 29853: abstract members
   'override',
   'prefer_baseclass',
-  'redirecting_factory',
+  // 'redirecting_factory', Issue 29853: redirecting factories
   'static_setter',
   'store_load',
   'stringliteral',
   'uninitialized_fields',
   'unused_methods',
   'void-methods',
 ];
 
 main(List<String> arguments) {
   if (arguments.isEmpty) {
@@ skipping 51 matching lines @@
   // find dart.core::Iterator.
   var loadedLibraries =
       await compiler.libraryLoader.loadLibrary(Uri.parse('dart:core'));
   compiler.processLoadedLibraries(loadedLibraries);
   var core = loadedLibraries.rootLibrary;
   compiler.startResolution();
   var cls = core.implementation.localLookup('Iterator');
   cls.ensureResolved(compiler.resolution);
   return compiler;
 }