bug#43725: 28.0.50; Include feature/native-comp into master

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: larsi@gnus.org, monnier@iro.umontreal.ca, 43725@debbugs.gnu.org
> Date: Sun, 21 Mar 2021 08:32:59 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > We have the command byte-compile-file, but we don't have its
> > equivalent native-compile command.  Should we have a
> > native-compile-file command?  I think we should, and I think it
> > should run synchronously, like byte-compile-file, i.e. it should run
> > the compilation in the Emacs session where the command was invoked,
> > not in a subprocess.
> >
> > WDYT?
> 
> `native-compile' invoked with a string as a FUNCTION-OR-FILE parameter
> accomplish that, is this sufficient?

It could be, but it isn't a command.  And please look at
byte-compile-file: it offers useful features, such as compiling the
file visited in the current buffer by default.