[turbofan] Add JSTests for TurboFan

This commit adds a single NumberToString test suite.
It recognizes the following revert by showing more than 100x improvement:
https://chromium-review.googlesource.com/c/v8/v8/+/1166783

Bug: chromium:865494
Change-Id: I93dab3f0b21e98565c76e65722e90a92adc41d72
Reviewed-on: https://chromium-review.googlesource.com/1181042
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55219}

test/js-perf-test/JSTests.json

@@ -1110,6 +1110,17 @@
         {"name": "UnaryPlus"},
         {"name": "ParseFloat"}
       ]
+    },
+    {
+      "name": "TurboFan",
+      "path": ["TurboFan"],
+      "main": "run.js",
+      "flags": [],
+      "resources": [ "typedLowering.js"],
+      "results_regexp": "^%s\\-TurboFan\\(Score\\): (.+)$",
+      "tests": [
+        {"name": "NumberToString"}
+      ]
     }
   ]
 }

test/js-perf-test/TurboFan/run.js

+// Copyright 2018 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");
+
+const iterations = 100;
+
+load("typedLowering.js");
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(name + "-TurboFan(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/TurboFan/typedLowering.js

+// Copyright 2018 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.
+
+function NumberToString() {
+  var ret;
+  var num = 10240;
+  var obj = {};
+
+  for ( var i = 0; i < num; i++ )
+    ret = obj["test" + num];
+}
+createSuite('NumberToString', 1000, NumberToString);