More tests updated to optimize code (Part 2).

tests/language/optimized_string_charat_test.dart

Index: tests/language/optimized_string_charat_test.dart
===================================================================
--- tests/language/optimized_string_charat_test.dart	(revision 24922)
+++ tests/language/optimized_string_charat_test.dart	(working copy)
@@ -1,6 +1,7 @@
 // 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.
+// VMOptions=--optimization-counter-threshold=10 --no-use-osr
 
 import "package:expect/expect.dart";
 
@@ -29,35 +30,35 @@
 
 main() {
   Expect.equals("a", test_charat(a, 0));
-  for (var i=0; i<10000; i++) test_charat(a, 0);
+  for (var i = 0; i < 20; i++) test_charat(a, 0);
   Expect.equals("a", test_charat(a, 0));
   Expect.equals("b", test_charat(a, 1));
   Expect.equals("c", test_charat(a, 2));
   Expect.throws(() => test_charat(a, 3));
 
   Expect.equals("a", test_const_str(0));
-  for (var i=0; i<10000; i++) test_const_str(0);
+  for (var i = 0; i < 20; i++) test_const_str(0);
   Expect.equals("a", test_const_str(0));
   Expect.equals("b", test_const_str(1));
   Expect.equals("c", test_const_str(2));
   Expect.throws(() => test_const_str(3));
 
   Expect.equals("a", test_const_index(a));
-  for (var i=0; i<10000; i++) test_const_index(a);
+  for (var i = 0; i < 20; i++) test_const_index(a);
   Expect.equals("a", test_const_index(a));
   Expect.equals("ø", test_const_index(b));
   Expect.equals(new String.fromCharCodes([123]), test_const_index(c));
   Expect.throws(() => test_const_index2(a));
 
   Expect.equals("ø", test_charat(b, 0));
-  for (var i=0; i<10000; i++) test_charat(b, 0);
+  for (var i = 0; i < 20; i++) test_charat(b, 0);
   Expect.equals("ø", test_charat(b, 0));
   Expect.equals("b", test_charat(b, 1));
   Expect.equals("c", test_charat(b, 2));
   Expect.throws(() => test_charat(b, 3));
 
   Expect.equals(new String.fromCharCodes([123]), test_charat(c, 0));
-  for (var i=0; i<10000; i++) test_charat(c, 0);
+  for (var i = 0; i < 20; i++) test_charat(c, 0);
   Expect.equals(new String.fromCharCodes([123]), test_charat(c, 0));
   Expect.equals(new String.fromCharCodes([456]), test_charat(c, 1));
   Expect.equals(new String.fromCharCodes([789]), test_charat(c, 2));