Handle use of constant constructors with default values.

tests/compiler/dart2js/serialization/equivalence_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 554 matching lines @@
         element1.isRedirectingFactory, element2.isRedirectingFactory);
     checkElementIdentities(element1, element2, 'effectiveTarget',
         element1.effectiveTarget, element2.effectiveTarget);
     checkElementIdentities(element1, element2, 'definingConstructor',
         element1.definingConstructor, element2.definingConstructor);
     check(
         element1, element2, 'effectiveTargetType',
         element1.computeEffectiveTargetType(element1.enclosingClass.thisType),
         element2.computeEffectiveTargetType(element2.enclosingClass.thisType),
         areTypesEquivalent);
+    check(
+        element1, element2, 'effectiveTargetType',
+        element1.computeEffectiveTargetType(element1.enclosingClass.rawType),
+        element2.computeEffectiveTargetType(element2.enclosingClass.rawType),
+        areTypesEquivalent);
     checkElementIdentities(element1, element2, 'immediateRedirectionTarget',
         element1.immediateRedirectionTarget,
         element2.immediateRedirectionTarget);
     checkElementIdentities(element1, element2, 'redirectionDeferredPrefix',
         element1.redirectionDeferredPrefix, element2.redirectionDeferredPrefix);
   }
 
   @override
   void visitAbstractFieldElement(AbstractFieldElement element1,
                                  AbstractFieldElement element2) {
@@ skipping 104 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.
   }
 }