bug#68690: Segmentation fault building with native-comp

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 24 Jan 2024 08:36:15 -0600
> From:  john muhl via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Bisect says 3018c6e7ba5 is the first bad commit. A build using
> ‘--without-native-compilation’ works fine. The segfault can be
> reproduced on Fedora 39 and Debian testing.
> 
> make bootstrap
> …
> make -C ../lisp compile-first EMACS="../src/bootstrap-emacs"
> make[3]: Entering directory '/home/jm/src/emacs-0/lisp'
>   ELC+ELN  emacs-lisp/macroexp.elc
>   ELC+ELN  emacs-lisp/cconv.elc
>   ELC+ELN  emacs-lisp/byte-opt.elc
>   ELC+ELN  emacs-lisp/bytecomp.elc
>   ELC+ELN  emacs-lisp/comp.elc
>   ELC+ELN  emacs-lisp/comp-cstr.elc
>   ELC+ELN  emacs-lisp/comp-common.elc
>   ELC+ELN  emacs-lisp/comp-run.elc
>   ELC+ELN  emacs-lisp/loaddefs-gen.elc
>   ELC+ELN  emacs-lisp/radix-tree.elc
> 
> Backtrace:
> ../src/bootstrap-emacs[0x57863b]
> ../src/bootstrap-emacs[0x42651e]

Adding Stefan, who installed that commit.