Serialize parameter nodes for local functions.

tests/compiler/dart2js/serialization/model_test_helper.dart

Index: tests/compiler/dart2js/serialization/model_test_helper.dart
diff --git a/tests/compiler/dart2js/serialization/model_test_helper.dart b/tests/compiler/dart2js/serialization/model_test_helper.dart
index e9bd90afe830cbd397ef5b972b311c0a6d638255..c43ce2277a598e83498611ec2b256ba78f898dfc 100644
--- a/tests/compiler/dart2js/serialization/model_test_helper.dart
+++ b/tests/compiler/dart2js/serialization/model_test_helper.dart
@@ -198,6 +198,10 @@ void checkElements(
                 localFunction1, localFunction2,
                 'enclosingClass',
                 localFunction1.enclosingClass, localFunction2.enclosingClass);
+            testResolvedAstEquivalence(
+                localFunction1.resolvedAst,
+                localFunction2.resolvedAst,
+                const CheckStrategy());
           });
     }
   }