Ensure metadata on imports/exports is resolved for serialization.

tests/compiler/dart2js/serialization/test_data.dart

Index: tests/compiler/dart2js/serialization/test_data.dart
diff --git a/tests/compiler/dart2js/serialization/test_data.dart b/tests/compiler/dart2js/serialization/test_data.dart
index 065bf660d0d43675dbb7669e179d9f3204a7fa91..bf8ecf8330739ef172d0f0389aacefb3bbe94879 100644
--- a/tests/compiler/dart2js/serialization/test_data.dart
+++ b/tests/compiler/dart2js/serialization/test_data.dart
@@ -693,6 +693,30 @@ const a = 1e+400;
 main() => a;
 ''',
   }),
+
+  const Test('Erroneous constructor', const {},
+      preserializedSourceFiles: const {
+    'main.dart': '''
+main() => new Null();
+'''}),
+
+  const Test('Metadata on imports', const {},
+      preserializedSourceFiles: const {
+        'main.dart': '''
+@deprecated
+import 'main.dart';
+
+main() {}
+'''}),
+
+  const Test('Metadata on exports', const {},
+      preserializedSourceFiles: const {
+        'main.dart': '''
+@deprecated
+export 'main.dart';
+
+main() {}
+'''}),
 ];
 
 class Test {