Expand ResolvedAst to handle synthetic constructors.

tests/compiler/dart2js/serialization_test.dart

 // Copyright (c) 2015, 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.serialization_test;
 
 import 'dart:io';
 import 'memory_compiler.dart';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/commandline_options.dart';
@@ skipping 329 matching lines @@
         String message =
             'Missing member for $member1 in\n ${members2.join('\n ')}';
         if (member1.isAbstractField) {
           // TODO(johnniwinther): Ensure abstract fields are handled correctly.
           //print(message);
           continue;
         } else {
           throw message;
         }
       }
-      //print('Checking member ${member1} against ${member2}');
       visit(member1, member2);
     }
   }
 
   @override
   void visitClassElement(ClassElement element1, ClassElement element2) {
     checkElementIdentities(null, null, null, element1, element2);
     check(element1, element2, 'name',
           element1.name, element2.name);
     check(element1, element2, 'sourcePosition',
@@ skipping 271 matching lines @@
   void visitPrefixElement(PrefixElement element1, PrefixElement element2) {
     check(
         element1, element2, 'isDeferred',
         element1.isDeferred, element2.isDeferred);
     checkElementIdentities(
         element1, element2, 'importedLibrary',
         element1.deferredImport, element2.deferredImport);
     // TODO(johnniwinther): Check members.
   }
 }