Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var _a = 120,
        _b = 60,
        A = 0,
        B = 1,
        C = 2;
  };
</script>

Test runner

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var a = new Int8Array(1),
    b = new Int8Array(1),
    c = new Int8Array(1);

a[0] = _a;
b[0] = _b;
c[0] = a[0] + b[0];

var abc = new Int8Array(3);
abc[A] = _a;
abc[B] = _b;
abc[C] = abc[A] + abc[B];

var abc = [];
abc[A] = _a;
abc[B] = _b;
abc[C] = abc[A] + abc[B];

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