Make it easier to test OSR with %OptimizeOsr() runtime call.

test/mjsunit/compiler/osr-top2.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --use-osr --turbo-osr
+// Flags: --use-osr --allow-natives-syntax
 
-function f(a) {
+for (var j = 0; j < 3; j++) {
   var sum = 0;
-  for (var j in a) {
-    var i = a[j];
+  for (var i = 0; i < 1000; i++) {
+    if (i == 100) %OptimizeOsr();
     var x = i + 2;
     var y = x + 5;
     var z = y + 3;
     sum += z;
   }
-  return sum;
+  assertEquals(509500, sum);
 }
 
-var a = new Array(10000);
-for (var i = 0; i < 10000; i++) {
-  a[i] = (i * 999) % 77;
-}
-
-for (var i = 0; i < 3; i++) {
-  assertEquals(480270, f(a));
-}
+assertEquals(509500, sum);