Add test for calling an empty function from unloaded deferred library.

tests/language/deferred_call_empty_before_load_test.dart

Index: tests/language/deferred_call_empty_before_load_test.dart
diff --git a/tests/compiler/dart2js_extra/22776_test.dart b/tests/language/deferred_call_empty_before_load_test.dart
similarity index 50%
copy from tests/compiler/dart2js_extra/22776_test.dart
copy to tests/language/deferred_call_empty_before_load_test.dart
index e9f12ea96362d55bb9fa50148f31bb5ea0c2e8d0..c241c6a90b494433cfe120f5771335444a333233 100644
--- a/tests/compiler/dart2js_extra/22776_test.dart
+++ b/tests/language/deferred_call_empty_before_load_test.dart
@@ -2,22 +2,12 @@
 // 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.
 
-// Regression test for http://dartbug.com/22776/
+// Test that calling a function, even though it itself has no effect, will
+// trigger an error if the corresponding deferred library has not been loaded.
 
 import "package:expect/expect.dart";
-
-class A {}
+import "deferred_call_empty_before_load_lib.dart" deferred as lib1;
 
 main() {
-  try {
-    print(id(new Duration(milliseconds: 10)));
-    print(id(3) ~/ new A());
-  } catch (e) {
-    print("Error '$e' ${e.runtimeType}");
-  }
+  Expect.throws(() => lib1.thefun());
 }
-
-@AssumeDynamic()
-@NoInline()
-id(x) => x;
-