lib: make queueMicrotask faster

No longer create an additional scope within queueMicrotask
in order to improve performance.

PR-URL: https://github.com/nodejs/node/pull/27032
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

benchmark/process/queue-microtask-depth.js

@@ -0,0 +1,17 @@
+'use strict';
+const common = require('../common.js');
+const bench = common.createBenchmark(main, {
+  n: [12e5]
+});
+
+function main({ n }) {
+  let counter = n;
+  bench.start();
+  queueMicrotask(onNextTick);
+  function onNextTick() {
+    if (--counter)
+      queueMicrotask(onNextTick);
+    else
+      bench.end(n);
+  }
+}