More tests updated to optimize code (Part 2).

tests/language/try_catch2_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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.
 // Dart test program for testing try/catch statement without any exceptions
 // being thrown. (Nested try/catch blocks).
+// VMOptions=--optimization-counter-threshold=10
 
 import "package:expect/expect.dart";
 
 abstract class TestException {
   String getMessage();
 }
 
 class MyException implements TestException {
   const MyException([String message = ""]) : message_ = message;
   String getMessage() { return message_; }
@@ skipping 38 matching lines @@
   }
 }
 
 class TryCatch2Test {
   static testMain() {
     Expect.equals(3, Helper.f1(1));
   }
 }
 
 main() {
-  for (var i = 0; i < 2000; i++) {
+  for (var i = 0; i < 20; i++) {
     TryCatch2Test.testMain();
   }
 }