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

In particular the Babel generated code for simple constructors is
of interest here, since that's what we hit in the wild most often
currently.

BUG=v8:6275
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2822203004
Cr-Commit-Position: refs/heads/master@{#44719}

test/js-perf-test/SixSpeed.json

@@ -27,6 +27,31 @@
         }
       ]
     },
+    {
+      "name": "Classes",
+      "path": ["SixSpeed"],
+      "results_regexp": "^%s\\(Score\\): (.+)$",
+      "tests": [
+        {
+          "name": "ES5",
+          "main": "run.js",
+          "resources": ["classes/es5.js"],
+          "test_flags": ["classes/es5"]
+        },
+        {
+          "name": "Babel",
+          "main": "run.js",
+          "resources": ["classes/babel.js"],
+          "test_flags": ["classes/babel"]
+        },
+        {
+          "name": "ES6",
+          "main": "run.js",
+          "resources": ["classes/es6.js"],
+          "test_flags": ["classes/es6"]
+        }
+      ]
+    },
     {
       "name": "Computed property names in object literals",
       "path": ["SixSpeed"],

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

+// 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();
+}

test/js-perf-test/SixSpeed/classes/es5.js

+// 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/>
+
+new BenchmarkSuite('ES5', [1000], [
+  new Benchmark('ES5', false, false, 0, ES5),
+]);
+
+function C() {
+  this.foo = 'bar';
+}
+
+C.prototype.bar = function() {};
+
+function ES5() {
+  return new C();
+};

test/js-perf-test/SixSpeed/classes/es6.js

+// 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/>
+
+new BenchmarkSuite('ES6', [1000], [
+  new Benchmark('ES6', false, false, 0, ES6),
+]);
+
+class C {
+  constructor() {
+    this.foo = 'bar';
+  }
+  bar() {}
+}
+
+function ES6() {
+  return new C();
+}