Support deserialized compilation of the empty program.

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;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_constructors.dart';
@@ skipping 3250 matching lines @@
   /// found through [declaration] since its node define the inheritance relation
   /// for the class. For unpatched elements the defining element is the element
   /// itself.
   AstElement get definingElement;
 
   bool get hasResolvedAst {
     return definingElement.hasNode && definingElement.hasTreeElements;
   }
 
   ResolvedAst get resolvedAst {
+    Node node = definingElement.node;
+    Node body;
+    if (definingElement.isField) {
+      FieldElement field = definingElement;
+      body = field.initializer;
+    } else if (node != null && node.asFunctionExpression() != null) {
+      body = node.asFunctionExpression().body;
+    }
     return new ParsedResolvedAst(
-        declaration, definingElement.node, definingElement.treeElements);
+        declaration, node, body, definingElement.treeElements);
   }
 }