src/v8/test/mjsunit/compiler/osr-assert.js

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// Flags: --use-osr --allow-natives-syntax

function f(x, b, c) {
  var outer = 10;
  var a = 1;
  while (outer > 0) {
    a = a + 5;
    assertEquals(b + 1, c);
    outer--;
    if (outer === 5) {
      %OptimizeOsr();
    }
  }
  return a + 4;
}

%PrepareFunctionForOptimization(f);
assertEquals(55, f(5, "122", "1221"));