benchmark: add util.toUSVString()'s benchmark

PR-URL: #40203
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>

benchmark/util/to-usv-string.js

@@ -0,0 +1,21 @@
+'use strict';
+
+const common = require('../common');
+
+const BASE = 'string\ud801';
+
+const bench = common.createBenchmark(main, {
+  n: [1e5],
+  size: [10, 100, 500],
+});
+
+function main({ n, size }) {
+  const { toUSVString } = require('util');
+  const str = BASE.repeat(size);
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    toUSVString(str);
+  }
+  bench.end(n);
+}