bug#45103: [feature/native-comp] add re-dumping support

[Eli Zaretskii]

> Cc: yqu212@gmail.com, 45103@debbugs.gnu.org
> Date: Sun, 29 Oct 2023 16:44:44 +0200
> From:  Björn Bidar via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> Where is the file stored? Should there be a variable to override the
> location of this file?

How would a variable help when we are installing the file as part of
"make install"?

And how would this variable help, if Emacs must load the dump file
before it can do anything else?

> I think ideally Emacs could load the file if found in the set location.

It does.  And we also have the --dump-file=FILE command-line option,
in case someone wants Emacs to load a specific file.