[Intl] Add String toLocale(Lower|Upper)Case perf benchmark

$ python -u tools/run_perf.py --binary-override-path   out/x64.release/d8 --filter "JSTests/Strings/StringToLocaleCase"  test/js-perf-test/JSTests.json
INFO      >>> Running suite: JSTests/Strings/StringToLocaleCase
INFO      >>> Stdout (#1):
StringToLocaleUpperCaseTR-Strings(Score): 622
StringToLocaleLowerCaseTR-Strings(Score): 728
StringToLocaleUpperCase-Strings(Score): 1129
StringToLocaleLowerCase-Strings(Score): 1548

Bug: v8:8839
Change-Id: I35e20c84614e99cb84ae51c175ac6b1cd53ad3a6
Reviewed-on: https://chromium-review.googlesource.com/c/1469327
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59615}

test/js-perf-test/JSTests.json

@@ -507,6 +507,20 @@
             {"name": "StringLocaleCompare"}
           ]
         },
+        {
+          "name": "StringToLocaleCase",
+          "main": "run.js",
+          "resources": [ "string-toLocaleCase.js" ],
+          "test_flags": [ "string-toLocaleCase" ],
+          "results_regexp": "^%s\\-Strings\\(Score\\): (.+)$",
+          "run_count": 1,
+          "tests": [
+            {"name": "StringToLocaleLowerCase"},
+            {"name": "StringToLocaleUpperCase"},
+            {"name": "StringToLocaleLowerCaseTR"},
+            {"name": "StringToLocaleUpperCaseTR"}
+          ]
+        },
         {
           "name": "StringMatchAll",
           "main": "run.js",

test/js-perf-test/Strings/string-toLocaleCase.js

+// Copyright 2019 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('StringToLocaleUpperCaseTR', [5], [
+  new Benchmark('StringToLocaleUpperCaseTR', false, false, 0,
+  StringToLocaleUpperCaseTR)
+]);
+new BenchmarkSuite('StringToLocaleLowerCaseTR', [5], [
+  new Benchmark('StringToLocaleLowerCaseTR', false, false, 0,
+  StringToLocaleLowerCaseTR),
+]);
+new BenchmarkSuite('StringToLocaleUpperCase', [5], [
+  new Benchmark('StringToLocaleUpperCase', false, false, 0,
+  StringToLocaleUpperCase)
+]);
+new BenchmarkSuite('StringToLocaleLowerCase', [5], [
+  new Benchmark('StringToLocaleLowerCase', false, false, 0,
+  StringToLocaleLowerCase),
+]);
+
+var shortString = "Îñţérñåţîöñåļîžåţîöñ Ļöçåļîžåţîöñ החןןם שםוןמ Γρεεκ ισ φθν 一二三";
+
+function StringToLocaleUpperCase() {
+  return shortString.toLocaleUpperCase();
+}
+function StringToLocaleLowerCase() {
+  return shortString.toLocaleLowerCase();
+}
+function StringToLocaleUpperCaseTR() {
+  return shortString.toLocaleUpperCase(["tr"]);
+}
+function StringToLocaleLowerCaseTR() {
+  return shortString.toLocaleLowerCase(["tr"]);
+}