bug#67005: 30.0.50; improve nadivce/comp/trampoline handling

[Andrea Corallo <acorallo@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> Cc: Jens Schmidt <jschmidt4gnu@vodafonemail.de>, 67005@debbugs.gnu.org
>> Date: Wed, 22 Nov 2023 11:07:38 -0500
>> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>> 
>> >>> Only slightly off-topic: When changing the default value of user option
>> >>> `native-comp-never-optimize-functions', which now both Andrea and I have
>> [...]
>> > Good to know I updated it since I changed the vaule first. Thanks Jens
>> > for noticing that.
>> 
>> BTW, why is it a `defcustom` rather than a `defvar`?
>> Do we really expect "normal users" to change it?
>
> Yes, we do.  I think they actually did already, maybe Andrea remembers
> which functions and why.

I remember as well they did it, but can't remember precisely the reason.
Actually I suspect it might have been before we had the trampoline
system up and running.  ATM I can't picture any reason why a user would
like to use this customize other than improving a specific backtrack or
preventing a certain trampoline to be created, but indeed I might miss
something.

  Andrea