More tests updated to optimize code (Part 2).

tests/language/optimized_lists_test.dart

Index: tests/language/optimized_lists_test.dart
===================================================================
--- tests/language/optimized_lists_test.dart	(revision 24922)
+++ tests/language/optimized_lists_test.dart	(working copy)
@@ -2,12 +2,13 @@
 // 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.
 // Test program for correct optimizations related to types fo allocated lists.
+// VMOptions=--optimization-counter-threshold=10
 
 import "package:expect/expect.dart";
 
 main() {
   // Trigger optimization of 'test' method.
-  for (int i = 0; i < 1000; i++) {
+  for (int i = 0; i < 20; i++) {
     test(2);
   }
 }