bug#41357: 28.0.50; GC may miss to mark calle safe register content

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: bug-gnu-emacs@gnu.org, eggert@cs.ucla.edu
> Date: Sun, 17 May 2020 16:40:09 +0000
> 
> I think this is a real bug that we have in the codebase (emacs-27
> included).

Maybe it's so, but your explanation makes sense only in the context of
calling a machine-language function.  When we call Lisp or bytecode,
the machine-level operation is very different, and I cannot easily
correlate your description of using registers with what happens when
we call Lisp or bytecode.  Sorry for my misunderstanding.