Handle rti for closures.

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 562b21d7cf1f3cd0ee213eac2d545aeb7eaf7e6e..44420f3935978ad36ce6785533922c1e5b6b75d9 100644
--- a/tests/compiler/dart2js/serialization/test_data.dart
+++ b/tests/compiler/dart2js/serialization/test_data.dart
@@ -416,6 +416,27 @@ main() {
 Unresolved m() {}
 ''',
   }),
+
+  const Test('Function types for closures', const {
+    'main.dart': '''
+import 'a.dart';
+
+typedef Func();
+
+main(args) {
+  (args.isEmpty ? new B() : new C()) is Func;
+}
+''',
+  }, preserializedSourceFiles: const {
+    'a.dart': '''
+class B {
+  call(a) {}
+}
+class C {
+  call() {}
+}
+''',
+  }),
 ];
 
 class Test {