v8/test/mjsunit/regress/regress-crbug-654723.js

// 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

var k = "0101010101010101" + "01010101";

function foo(s) {
  return k + s;
};
%PrepareFunctionForOptimization(foo);
foo("a");
foo("a");
%OptimizeFunctionOnNextCall(foo);
var x = foo("");