test: add regression tests

This makes sure util.isDate and util.isRegExp will not abort in case
more than one argument is passed to the utility function.

PR-URL: https://github.com/nodejs/node/pull/19188


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>