Disable kernel unit tests.

pkg/kernel/test/baseline_type_propagation_test_disabled.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.
 import 'package:kernel/kernel.dart';
 import 'package:kernel/text/ast_to_text.dart';
 import 'package:kernel/transformations/mixin_full_resolution.dart';
 import 'package:kernel/type_propagation/builder.dart';
 import 'package:kernel/type_propagation/solver.dart';
 import 'package:kernel/type_propagation/visualizer.dart';
 
@@ skipping 21 matching lines @@
     solver.solve();
     visualizer.solver = solver;
     annotator = new TextAnnotator(visualizer);
     return const <String>[];
   }
 }
 
 void main() {
   runBaselineTests('type-propagation', new TypePropagationTest());
 }