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

test/mjsunit/compiler/osr-simple.js

 // Copyright 2010 the V8 project authors. All rights reserved.
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+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 // Flags: --use-osr
 
 function f() {
   var sum = 0;
   for (var i = 0; i < 1000000; i++) {
     var x = i + 2;
     var y = x + 5;
     var z = y + 3;
     sum += z;
   }
   return sum;
 }
 
 
 for (var i = 0; i < 2; i++) {
   assertEquals(500009500000, f());
 }