Dart2js, move deferred global vars to the right output unit.

tests/language/deferred_global_test.dart

Index: tests/language/deferred_global_test.dart
diff --git a/tests/language/deferred_global_test.dart b/tests/language/deferred_global_test.dart
index 709921ea5b8e855fb3a0624975beecfdf72bb71a..5c9fa1ce7ac90c953c55d0b8200eb071b724d9ca 100644
--- a/tests/language/deferred_global_test.dart
+++ b/tests/language/deferred_global_test.dart
@@ -40,6 +40,8 @@ void main() {
     Expect.equals("lazyConstGlobal_mutated2", lib.readLazyConstGlobal());
     Expect.equals("lazyNonConstGlobal_mutated2", lib.readLazyNonConstGlobal());
 
+    Expect.mapEquals({}, lib.lazyConstGlobal2);
+
     Expect.equals(2, lib.sideEffectCounter);
     asyncEnd();
   });