bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: sbaugh@janestreet.com, sbaugh@catern.com, rms@gnu.org, dmitry@gutov.dev,
>  michael.albinus@gmx.de, 64735@debbugs.gnu.org
> Date: Sun, 23 Jul 2023 08:16:05 +0000
> 
> With emacs -Q, the results are similar in terms of absolute time spent
> doing GC:
> 
> (("built-in" . "Elapsed time: 5.706795s (3.332933s in 304 GCs)")
>  ("built-in no handlers" . "Elapsed time: 4.535871s (3.161111s in 301 GCs)")
>  ("with-find" . "Elapsed time: 4.829426s (3.333890s in 274 GCs)"))

Strange.  On my system, GC takes about 8% of the run time.  Maybe it's
a function of how many files are retrieved?