Fixed dart2js compile errors in ir_builder and ir_nodes.

sdk/lib/_internal/compiler/implementation/ir/ir_builder.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 dart2js.ir_builder;
 
 import 'ir_nodes.dart' as ir;
 import '../elements/elements.dart';
 import '../dart2jslib.dart';
 import '../dart_types.dart';
@@ skipping 1162 matching lines @@
         ir.InvokeStatic invoke =
             new ir.InvokeStatic(element, selector, k, [arg]);
         add(new ir.LetCont(k, invoke));
         return arg;
       } else if (node.receiver == null) {
         // Nodes that fall in this case:
         // - Unresolved top-level
         // - Assignment to final variable (will not be resolved)
         return giveup(node, 'SendSet: non-local, non-static, but no receiver');
       } else {
-        if (element != null && Elements.isUnresolved(element)) return giveup();
+        if (element != null && Elements.isUnresolved(element)) {
+          return giveup(node);
+        }
 
         // Setter or index-setter invocation
         assert(node.receiver != null);
 
         if (node.receiver.isSuper()) return giveup(node, 'Super SendSet');
 
         ir.Primitive receiver = node.receiver == null
             ? lookupThis()
             : visit(node.receiver);
         ir.Parameter v = new ir.Parameter(null);
@@ skipping 116 matching lines @@
       if (e == ABORT_IRNODE_BUILDER) return null;
       rethrow;
     }
   }
 
   void internalError(String reason, {ast.Node node}) {
     giveup(node);
   }
 }