[js-perf-tests] Add classes benchmarks from SixSpeed.

test/js-perf-test/SixSpeed/classes/babel.js

Index: test/js-perf-test/SixSpeed/classes/babel.js
diff --git a/test/js-perf-test/SixSpeed/classes/babel.js b/test/js-perf-test/SixSpeed/classes/babel.js
new file mode 100644
index 0000000000000000000000000000000000000000..e73ec1ae0c36513870911c57bea7f3c90899bf0c
--- /dev/null
+++ b/test/js-perf-test/SixSpeed/classes/babel.js
@@ -0,0 +1,51 @@
+// Copyright 2017 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/>
+
+'use strict';
+
+new BenchmarkSuite('Babel', [1000], [
+  new Benchmark('Babel', false, false, 0, Babel),
+]);
+
+var _createClass = function() {
+  function defineProperties(target, props) {
+    for (var i = 0; i < props.length; i++) {
+      var descriptor = props[i];
+      descriptor.enumerable = descriptor.enumerable || false;
+      descriptor.configurable = true;
+      if ('value' in descriptor) descriptor.writable = true;
+      Object.defineProperty(target, descriptor.key, descriptor);
+    }
+  }
+  return function(Constructor, protoProps, staticProps) {
+    if (protoProps) defineProperties(Constructor.prototype, protoProps);
+    if (staticProps) defineProperties(Constructor, staticProps);
+    return Constructor;
+  };
+}();
+
+function _classCallCheck(instance, Constructor) {
+  if (!(instance instanceof Constructor)) {
+    throw new TypeError('Cannot call a class as a function');
+  }
+}
+
+var C = function() {
+  function C() {
+    _classCallCheck(this, C);
+
+    this.foo = 'bar';
+  }
+
+  _createClass(C, [{key: 'bar', value: function bar() {}}]);
+
+  return C;
+}();
+
+function Babel() {
+  return new C();
+}