Build new IR for functions returning a constant

sdk/lib/_internal/compiler/implementation/elements/elements.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 elements;
 
 
 import '../tree/tree.dart';
 import '../util/util.dart';
 import '../resolution/resolution.dart';
@@ skipping 772 matching lines @@
   DartType get type;
   FunctionSignature get functionSignature;
   FunctionElement get redirectionTarget;
   FunctionElement get defaultImplementation;
 
   FunctionElement get patch;
   FunctionElement get origin;
 
   bool get isRedirectingFactory;
 
+  void setAbstract();
+
   /**
    * Compute the type of the target of a redirecting constructor or factory
    * for an instantiation site with type [:newType:].
    *
    * TODO(karlklose): get rid of this method and resolve the target type
    * during resolution when we correctly resolve chains of redirections.
    */
   InterfaceType computeTargetType(Compiler compiler,
                                   InterfaceType newType);
 
@@ skipping 176 matching lines @@
   int get resolutionState;
   Token get beginToken;
   Token get endToken;
 
   // TODO(kasperl): Try to get rid of these.
   void set annotatedElement(Element value);
   void set resolutionState(int value);
 
   MetadataAnnotation ensureResolved(Compiler compiler);
 }