Add CoreClasses

pkg/compiler/lib/src/elements/modelx.dart

 // Copyright (c) 2013, 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 elements.modelx;
 
 import '../common.dart';
 import '../common/resolution.dart' show
     Resolution,
     Parsing;
@@ skipping 2595 matching lines @@
     assert(invariant(this, supertypeLoadState == STATE_DONE,
         message: "Superclass has not been computed for $this."));
     return supertype == null ? null : supertype.element;
   }
 
   void forEachBackendMember(void f(Element member)) {
     backendMembers.forEach(f);
   }
 
   bool implementsFunction(Compiler compiler) {
-    return asInstanceOf(compiler.functionClass) != null || callType != null;
+    return asInstanceOf(compiler.coreClasses.functionClass) != null ||
+        callType != null;
   }
 
   // TODO(johnniwinther): Remove these when issue 18630 is fixed.
   ClassElement get patch => super.patch;
   ClassElement get origin => super.origin;
 
   // A class declaration is defined by the declaration element.
   AstElement get definingElement => declaration;
 }
 
@@ skipping 474 matching lines @@
   AstElement get definingElement;
 
   bool get hasResolvedAst => definingElement.hasTreeElements;
 
   ResolvedAst get resolvedAst {
     return new ResolvedAst(declaration,
         definingElement.node, definingElement.treeElements);
   }
 
 }