[js-perf-test] Add RegExp microbenchmarks

test/js-perf-test/RegExp/base_test.js

Index: test/js-perf-test/RegExp/base_test.js
diff --git a/test/js-perf-test/RegExp/base_test.js b/test/js-perf-test/RegExp/base_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..d4b79451c9d420345843a9570d758f8bc3a45023
--- /dev/null
+++ b/test/js-perf-test/RegExp/base_test.js
@@ -0,0 +1,26 @@
+// 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");
+
+var str;
+var re;
+
+function SimpleTest() {
+  re.test(str);
+}
+
+function Test1Setup() {
+  re = /[Cz]/;
+  str = createHaystack();
+}
+
+function Test2Setup() {
+  re = /[cZ]/;  // Not found.
+  str = createHaystack();
+}
+
+var benchmarks = [ [SimpleTest, Test1Setup],
+                   [SimpleTest, Test2Setup],
+                 ];