Serialize erroneous element and more

tests/compiler/dart2js/serialization/test_helper.dart

 // Copyright (c) 2016, 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_helper;
 
 import 'dart:collection';
 import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/constants/expressions.dart';
 import 'package:compiler/src/dart_types.dart';
@@ skipping 535 matching lines @@
         (mismatch.isNotEmpty && failOnMismatch) ||
         remaining.isNotEmpty) {
       Expect.fail(message);
     } else {
       print(message);
     }
   } else if (verbose) {
     print(message);
   }
 }
+
+void checkAllResolvedAsts(
+    Compiler compiler1,
+    Compiler compiler2,
+    {bool verbose: false}) {
+  checkLoadedLibraryMembers(
+      compiler1,
+      compiler2,
+      (Element member1) {
+        return member1 is ExecutableElement &&
+            compiler1.resolution.hasResolvedAst(member1);
+      },
+      checkResolvedAsts,
+      verbose: verbose);
+}
+
+
+/// Check equivalence of [impact1] and [impact2].
+void checkResolvedAsts(Compiler compiler1, Element member1,
+    Compiler compiler2, Element member2,
+    {bool verbose: false}) {
+  if (!compiler2.serialization.isDeserialized(member2)) {
+    return;
+  }
+  ResolvedAst resolvedAst1 = compiler1.resolution.getResolvedAst(member1);
+  ResolvedAst resolvedAst2 = compiler2.serialization.getResolvedAst(member2);
+
+  if (resolvedAst1 == null || resolvedAst2 == null) return;
+
+  if (verbose) {
+    print('Checking resolved asts for $member1 vs $member2');
+  }
+
+  testResolvedAstEquivalence(
+      resolvedAst1, resolvedAst2, const CheckStrategy());
+}