Code in benchmark directory sometimes uses `function () {}` for
anonymous callbacks and sometimes uses `() => {}`. Multi-line arrays
sometimes have a trailing comma and sometimes do not. Update to always
use arrow functions for anonymous callbacks and trailing commas for
multiline arrays.

PR-URL: https://github.com/nodejs/node/pull/25944
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

This significantly reduces the benchmark runtime. It removes to many
variations that do not provide any benefit and reduces the iterations.

PR-URL: https://github.com/nodejs/node/pull/22503
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

Fixes: https://github.com/nodejs/node/issues/21963
PR-URL: https://github.com/nodejs/node/pull/21964
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1) Add missing unit tests by `ucs-2` in different kinds of cases.
2) Add missing unit tests by `usc-2` in different kinds of cases.
3) Fix a bug：We cannot find `ucs-2` in `case 5`'s `if` condition after
`toLowerCase()`

PR-URL: https://github.com/nodejs/node/pull/21455
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/18250
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/14881
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

* Improve readability of util.normalizeEncoding
  and add some comments
* Add a benchmark for util.normalizeEncoding

PR-URL: https://github.com/nodejs/node/pull/10439
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>