Add VMOptions to optimize tests that need to be (Part I).

tests/language/arithmetic_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 to test arithmetic operations.
+// VMOptions=--optimization-counter-threshold=10 --no-use-osr
 
 library arithmetic_test;
 import "package:expect/expect.dart";
 import 'dart:math';
 
 class ArithmeticTest {
 
   static bool exceptionCaughtParseInt(String s) {
     try {
       int.parse(s);
@@ skipping 419 matching lines @@
     Expect.equals(2.0, mySqrt(4.0));
     Expect.throws(() => mySqrt("abc"));
   }
 
   static self_equality(x) {
     return x == x;
   }
 
   static testDoubleEquality() {
     Expect.isFalse(self_equality(double.NAN));
-    for (int i = 0; i < 2000; i++) {
+    for (int i = 0; i < 20; i++) {
       self_equality(3.0);
     }
     Expect.isFalse(self_equality(double.NAN));
   }
 
   static testMain() {
-    for (int i = 0; i < 1500; i++) {
+    for (int i = 0; i < 20; i++) {
       runOne();
       testSmiDivDeopt();
       testSqrtDeopt();
       testDoubleEquality();
     }
   }
 }
 
 main() {
   ArithmeticTest.testMain();
 }