dart2js: create a 'types' table for each deferred unit.

tests/language/deferred_function_type_test.dart

Index: tests/language/deferred_function_type_test.dart
diff --git a/tests/compiler/dart2js/dart2js_batch2_run.dart b/tests/language/deferred_function_type_test.dart
similarity index 66%
copy from tests/compiler/dart2js/dart2js_batch2_run.dart
copy to tests/language/deferred_function_type_test.dart
index aee55ef18e5fa77c47bcbf53f5c16125299ed77a..59897c7745263888ec1987d81ed5721698219658 100644
--- a/tests/compiler/dart2js/dart2js_batch2_run.dart
+++ b/tests/language/deferred_function_type_test.dart
@@ -2,9 +2,10 @@
 // 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.
 
-@notExisting
-var x;
+import 'deferred_function_type_lib.dart' deferred as lib;
 
 main() {
-  print(x);
-}
+  lib.loadLibrary().then((_) {
+    lib.runTest();
+  });
+}