Implement dynamicType and voidType as TypeMirrors not ClassMirrors. Issue 11743.

runtime/tests/vm/dart/isolate_mirror_local_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.
 //
 // Dart test program for checking implemention of MirrorSystem when
 // inspecting the current isolate.
 //
 // VMOptions=--enable_type_checks
 
 library isolate_mirror_local_test;
@@ skipping 326 matching lines @@
   //               oom_cls.toString());
   testDone('testLibrariesMap');
 }
 
 void testMirrorSystem(MirrorSystem mirrors) {
   Expect.isTrue(mirrors.isolate.debugName.contains('main'));
   testRootLibraryMirror(mirrors.isolate.rootLibrary);
   testLibrariesMap(mirrors.libraries);
   Expect.equals(const Symbol('void'), mirrors.voidType.simpleName);
   Expect.equals(const Symbol('dynamic'), mirrors.dynamicType.simpleName);
+  Expect.isTrue(mirrors.voidType is TypeMirror);
+  Expect.isTrue(mirrors.dynamicType is TypeMirror);
+  Expect.isFalse(mirrors.voidType is ClassMirror);
+  Expect.isFalse(mirrors.dynamicType is ClassMirror);
   testDone('testMirrorSystem');
 }
 
 void testIntegerInstanceMirror(InstanceMirror mirror) {
   Expect.equals(const Symbol('int'), mirror.type.simpleName);
   Expect.isTrue(mirror.hasReflectee);
   Expect.equals(1001, mirror.reflectee);
   Expect.equals("InstanceMirror on 1001", mirror.toString());
 
   // Invoke (mirror + mirror).
@@ skipping 178 matching lines @@
   // Test that an isolate can reflect on itself.
   mirrorSystemOf(exit_port.toSendPort()).then(testMirrorSystem);
 
   testIntegerInstanceMirror(reflect(1001));
   testStringInstanceMirror(reflect('This\nis\na\nString'));
   testBoolInstanceMirror(reflect(true));
   testNullInstanceMirror(reflect(null));
   testCustomInstanceMirror(reflect(new MyClass(17)));
   testMirrorErrors(currentMirrorSystem());
 }