bug#68244: hash-table improvements

[Eli Zaretskii]

> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Thu, 4 Jan 2024 18:02:08 +0100
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,
>  68244@debbugs.gnu.org
> 
> 4 jan. 2024 kl. 17.39 skrev Eli Zaretskii <eliz@gnu.org>:
> 
> > Any data about the actual performance gains?
> 
> Lots, naturally, but hash tables have many moving parts and performance is 
> many-dimensional which is why I didn't include the raw data; it's voluminous 
> and not always easy to interpret. Giving a single number as in 'now 20 % 
> faster' is impossible if we want to stay honest, because there are so many 
> different aspects, contexts and operations.

It doesn't have to be a single number.  Showing a series of separate
benchmarks is also fine.