Add CoreClasses

pkg/compiler/lib/src/resolution/constructors.dart

 // Copyright (c) 2015, 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 dart2js.resolution.constructors;
 
 import '../common.dart';
 import '../compiler.dart' show
     Compiler;
 import '../constants/constructors.dart' show
@@ skipping 128 matching lines @@
       } else {
         isValidAsConstant = false;
       }
     }
   }
 
   InterfaceType getSuperOrThisLookupTarget(Node diagnosticNode,
                                            {bool isSuperCall}) {
     if (isSuperCall) {
       // Calculate correct lookup target and constructor name.
-      if (identical(constructor.enclosingClass, visitor.compiler.objectClass)) {
+      if (constructor.enclosingClass.isObject) {
         reporter.reportErrorMessage(
             diagnosticNode, MessageKind.SUPER_INITIALIZER_IN_OBJECT);
         isValidAsConstant = false;
       } else {
         return constructor.enclosingClass.supertype;
       }
     }
     return constructor.enclosingClass.thisType;
   }
 
@@ skipping 43 matching lines @@
         isValidAsConstant = false;
       }
     }
     return new ResolutionResult.forElement(calledConstructor);
   }
 
   ConstructedConstantExpression resolveImplicitSuperConstructorSend() {
     // If the class has a super resolve the implicit super call.
     ClassElement classElement = constructor.enclosingClass;
     ClassElement superClass = classElement.superclass;
-    if (classElement != visitor.compiler.objectClass) {
+    if (!classElement.isObject) {
       assert(superClass != null);
       assert(superClass.isResolved);
 
       InterfaceType targetType =
           getSuperOrThisLookupTarget(functionNode, isSuperCall: true);
       ClassElement lookupTarget = targetType.element;
       Selector constructorSelector = new Selector.callDefaultConstructor();
       ConstructorElement calledConstructor = findConstructor(
           constructor.library,
           lookupTarget,
@@ skipping 529 matching lines @@
     // constructors.
     return null;
   }
   // TODO(johnniwinther): Use [Name] for lookup.
   ConstructorElement constructor = cls.lookupConstructor(constructorName);
   if (constructor != null) {
     constructor = constructor.declaration;
   }
   return constructor;
 }