src/v8/test/mjsunit/regress/regress-freeze.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// Flags: --allow-natives-syntax

// CountOperation
function f(o) {
  o.x++;
};
%PrepareFunctionForOptimization(f);
;
var o = {x: 5};
Object.freeze(o);
f(o);
f(o);
%OptimizeFunctionOnNextCall(f);
f(o);
assertEquals(5, o.x);

// Compound Assignment
function f2(o) {
  o.x += 3;
};
%PrepareFunctionForOptimization(f2);
;
f2(o);
f2(o);
%OptimizeFunctionOnNextCall(f2);
f2(o);
assertEquals(5, o.x);