Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a, b;
    
    function ta() {
      a = a || {};
    }
    
    function tb() {
      if (!b) {
        b = {}
      };
    }
  };
</script>

Test runner

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ta();
a = undefined;

tb();
b = undefined;

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