v8/test/mjsunit/load_poly_effect.js

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// Flags: --allow-natives-syntax

var o = {};
var count = 0;
Object.defineProperty(o, "x", {get:function(){count++;return 100}});

function load(o, o2) {
  return 1 + (o.x, o2.x_tagged);
}

var deopt = false;
var o2 = {x_tagged:{}};
o2.x_tagged = 1;

%PrepareFunctionForOptimization(load);
load({x:1}, o2);
load({x:1}, o2);
print(load(o, o2));
%OptimizeFunctionOnNextCall(load);
o2.x_tagged = true;
print(load(o, o2));