[js-perf-test] Add a basic async-await microbenchmark

test/js-perf-test/AsyncAwait/run.js

+// Copyright 2016 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('baseline-babel-es2017.js');
+load('baseline-naive-promises.js');
+load('native.js');
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(name + '-AsyncAwait(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 });