Add spread call micro-benchmarks.

test/js-perf-test/SixSpeed/spread/spread.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This benchmark is based on the six-speed benchmark build output.
+// Copyright 2014 Kevin Decker <https://github.com/kpdecker/six-speed/>
+
+
+new BenchmarkSuite('Spread-ES5', [1000], [
+  new Benchmark('ES5', false, false, 0, ES5),
+]);
+
+new BenchmarkSuite('Spread-Traceur', [1000], [
+  new Benchmark('Traceur', false, false, 0, Traceur),
+]);
+
+new BenchmarkSuite('Spread-ES6', [1000], [
+  new Benchmark('ES6', false, false, 0, ES6),
+]);
+
+// ----------------------------------------------------------------------------
+// Benchmark: ES5
+// ----------------------------------------------------------------------------
+
+function ES5() {
+  "use strict";
+  return Math.max.apply(Math, [1,2,3]);
+}
+
+// ----------------------------------------------------------------------------
+// Benchmark: Traceur
+// ----------------------------------------------------------------------------
+
+function checkObjectCoercible(v) {
+  "use strict";
+  if (v === null || v === undefined) {
+    throw new $TypeError('Value cannot be converted to an Object');
+  }
+  return v;
+}
+
+function spread() {
+  "use strict";
+  var rv = [],
+      j = 0,
+      iterResult;
+  for (var i = 0; i < arguments.length; i++) {
+    var valueToSpread = checkObjectCoercible(arguments[i]);
+    if (typeof valueToSpread[Symbol.iterator] !== 'function') {
+      throw new TypeError('Cannot spread non-iterable object.');
+    }
+    var iter = valueToSpread[Symbol.iterator]();
+    while (!(iterResult = iter.next()).done) {
+      rv[j++] = iterResult.value;
+    }
+  }
+  return rv;
+}
+
+function Traceur() {
+  "use strict";
+  var $__0;
+  return ($__0 = Math).max.apply($__0, spread([1, 2, 3]));
+}
+
+// ----------------------------------------------------------------------------
+// Benchmark: ES6
+// ----------------------------------------------------------------------------
+
+function ES6() {
+  "use strict";
+  return Math.max(...[1,2,3]);
+}