v8/test/mjsunit/compiler/regress-733181.js

// Copyright 2017 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 l(s) {
  return ("xxxxxxxxxxxxxxxxxxxxxxx" + s).toLowerCase();
}

%PrepareFunctionForOptimization(l);
l("abcd");
l("abcd");
%OptimizeFunctionOnNextCall(l);
l("abcd");

function u(s) {
  return ("xxxxxxxxxxxxxxxxxxxxxxx" + s).toUpperCase();
}

%PrepareFunctionForOptimization(u);
u("abcd");
u("abcd");
%OptimizeFunctionOnNextCall(u);
u("abcd");