[tests] add microbenchmark for %TypedArray%.prototype.copyWithin

test/js-perf-test/TypedArrays/run.js

+// Copyright 2014 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('typedarrays.js');
+
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(`TypedArrays-${name}(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 });