Build new IR for functions returning a constant

sdk/lib/_internal/compiler/implementation/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 'elements.dart';
 import '../../compiler.dart' as api;
 import '../tree/tree.dart';
+import '../ir/ir.dart' show IFunction;
 import '../util/util.dart';
 import '../resolution/resolution.dart';
 
 import '../dart2jslib.dart' show invariant,
                                  InterfaceType,
                                  DartType,
                                  TypeVariableType,
                                  TypedefType,
                                  DualKind,
                                  MessageKind,
@@ skipping 1500 matching lines @@
       return 'origin ${super.toString()}';
     } else {
       return super.toString();
     }
   }
 
   bool isAbstract(Compiler compiler) {
     if (super.isAbstract(compiler)) return true;
     if (modifiers.isExternal()) return false;
     if (isFunction() || isAccessor()) {
+      if (compiler.irBuilder.iNodes.containsKey(this)) {

[kasperl, 2013/11/06 08:30:04]

How bad would it be to refer to the IR nodes directly from FunctionElements? If
nothing else, I'd add a couple of helpers -- one to ask if we have IR for a
FunctionElement and one to fetch the IR.

[lukas, 2013/11/06 11:36:08]

Done.

+        return !(compiler.irBuilder.iNodes[this] as IFunction).hasBody();
+      }
       return compiler.withCurrentElement(this,
           () => !parseNode(compiler).hasBody());

[ngeoffray, 2013/11/05 12:58:35]

We should make sure we don't do this.

[lukas, 2013/11/06 11:36:08]

Done.

     }
     return false;
   }
 }
 
 class ConstructorBodyElementX extends FunctionElementX
     implements ConstructorBodyElement {
   FunctionElement constructor;
 
   ConstructorBodyElementX(FunctionElement constructor)
@@ skipping 821 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }