[js-perf-test] add microbenchmarks for C-style for loops

Adds some benchmarks copied from v8:4762.

BUG=v8:4762, v8:5460
R=adamk@chromium.org

Change-Id: I0b96080042781c2c46c0c8a3896a921bde97c1e5
Reviewed-on: https://chromium-review.googlesource.com/475934Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Cr-Commit-Position: refs/heads/master@{#44629}

test/js-perf-test/ForLoops/for_loop.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.
+
+new BenchmarkSuite('Let-Standard', [1000], [
+  new Benchmark('Let-Standard', false, false, 0, LetLoop),
+]);
+
+new BenchmarkSuite('Var-Standard', [1000], [
+  new Benchmark('Var-Standard', false, false, 0, VarLoop),
+]);
+
+var x = [-1, 1, 4];
+var y = [-11, -1, 1, 2, 3, 4, 5, 6, 20, 44, 87, 99, 100];
+
+function LetLoop() {
+  "use strict";
+  const ret = [];
+  for (let i = 0; i < x.length; i++) {
+    for (let z = 0; z < y.length; z++) {
+      if (x[i] == y[z]) {
+        ret.push(x[i]);
+        break;
+      }
+    }
+  }
+  return ret;
+}
+
+function VarLoop() {
+  "use strict";
+  const ret = [];
+  for (var i = 0; i < x.length; i++) {
+    for (var z = 0; z < y.length; z++) {
+      if (x[i] == y[z]) {
+        ret.push(x[i]);
+        break;
+      }
+    }
+  }
+  return ret;
+}

test/js-perf-test/ForLoops/run.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.
+
+load('../base.js');
+load('for_loop.js');
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(name + '-ForLoop(Score): ' + result);
+}
+
+
+function PrintError(name, error) {
+  PrintResult(name, error);
+  success = false;
+}
+
+
+BenchmarkSuite.config.doWarmup = undefined;
+BenchmarkSuite.config.doDeterministic = undefined;
+
+BenchmarkSuite.RunSuites({ NotifyResult: PrintResult,
+                           NotifyError: PrintError });

test/js-perf-test/JSTests.json

@@ -382,6 +382,19 @@
         {"name": "FastMap"},
         {"name": "ObjectMap"}
       ]
+    },
+    {
+      "name": "ForLoops",
+      "path": ["ForLoops"],
+      "main": "run.js",
+      "resources": [
+        "for_loop.js"
+      ],
+      "results_regexp": "^%s\\-ForLoop\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "Let-Standard"},
+        {"name": "Var-Standard"}
+      ]
     }
   ]
 }