// Copyright 2016 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: --allow-natives-syntax

(function() {
  "use asm";
  var f = function() {
    for (var i = 0; i < 10; i++) {
      if (i == 5) {
        %OptimizeOsr();
      }
    }
    with (Object());
  };
  %PrepareFunctionForOptimization(f);
  return f;
})()();
