bug#57789: Emacs 28.1 clone build with native compilation crashes on s390x

[Eli Zaretskii]

> From: Rob Browning <rlb@defaultvalue.org>
> Date: Tue, 13 Sep 2022 20:04:32 -0500
> 
> On zelenka.debian.org https://db.debian.org/machines.cgi?host=zelenka
> the build crashes with a segfault with current Debian sid (unstable).  I
> can produce the crash like this:
> 
>   git clone --single-branch --branch emacs-28 .../emacs.git

If you build the current emacs-28 branch, then it isn't Emacs 28.1,
it's Emacs 28.2.50, right?

>   cd emacs
>   ./autogen.sh
>   ./configure --prefix=/home/rlb/opt/emacs-tmp --with-native-compilation
>   make check
> 
> The debian package produced a similar failure earlier:
> 
>   
> https://buildd.debian.org/status/fetch.php?pkg=emacs&arch=s390x&ver=1%3A28.1%2B1-3&stamp=1662863442&raw=0
> 
> Here's the final bit of the clone build's log, and I'm happy to help
> test on the machine if that'd be useful:

Please run the crashing command under GDB, and when it segfaults,
produce the C-level and Lisp-level backtrace, and post them here.

Thanks.