[modules] Add a simple micro-benchmark for import/export accesses.

test/js-perf-test/Modules/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');
+
+
+new BenchmarkSuite('BasicExport', [100], [
+  new Benchmark('BasicExport', false, false, 0, BasicExport)
+]);
+
+new BenchmarkSuite('BasicImport', [100], [
+  new Benchmark('BasicImport', false, false, 0, BasicImport)
+]);
+
+new BenchmarkSuite('BasicNamespace', [100], [
+  new Benchmark('BasicNamespace', false, false, 0, BasicNamespace)
+]);
+
+
+const iterations = 3000000;
+
+
+function BasicExport() {
+  let success = false;
+  import("basic-export.js").then(_ => success = true);
+  %RunMicrotasks();
+  if (!success) throw new Error(666);
+}
+
+function BasicImport() {
+  let success = false;
+  import("basic-import.js").then(_ => success = true);
+  %RunMicrotasks();
+  if (!success) throw new Error(666);
+}
+
+function BasicNamespace() {
+  let success = false;
+  import("basic-namespace.js").then(_ => success = true);
+  %RunMicrotasks();
+  if (!success) throw new Error(666);
+}
+
+
+var success = true;
+
+function PrintResult(name, result) {
+  print(name + '-Modules(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 });