Support new malformed types semantics.

sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.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.
 
 library mirrors_dart2js;
 
 import 'dart:async';
 import 'dart:collection' show LinkedHashMap;
 
 import '../../compiler.dart' as api;
@@ skipping 1066 matching lines @@
 
   InterfaceType get _interfaceType => _type;
 
   String get qualifiedName => originalDeclaration.qualifiedName;
 
   // TODO(johnniwinther): Substitute type arguments for type variables.
   Map<String, MemberMirror> get members => originalDeclaration.members;
 
   bool get isObject => mirrors.compiler.objectClass == _type.element;
 
-  bool get isDynamic => mirrors.compiler.dynamicClass == _type.element;
+  // TODO(johnniwinther): How to show malformed types?
+  bool get isDynamic => _type.isDynamic;
 
   ClassMirror get originalDeclaration
       => new Dart2JsClassMirror(mirrors, _type.element);
 
   // TODO(johnniwinther): Substitute type arguments for type variables.
   ClassMirror get superclass => originalDeclaration.superclass;
 
   // TODO(johnniwinther): Substitute type arguments for type variables.
   List<ClassMirror> get superinterfaces => originalDeclaration.superinterfaces;
 
@@ skipping 650 matching lines @@
  *
  * All API in this class is experimental.
  */
 class BackDoor {
   /// Return the compilation units comprising [library].
   static List<Mirror> compilationUnitsOf(Dart2JsLibraryMirror library) {
     return library._library.compilationUnits.toList().map(
         (cu) => new Dart2JsCompilationUnitMirror(cu, library)).toList();
   }
 }