bug#56495: 29.0.50; Support for debugging Emacs with LLDB

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Date: Mon, 11 Jul 2022 10:13:35 +0200
> 
> Attached patch adds rather limited support for that.  Limited by
> 
> - the fact that I don't know LLDB,
> - that I don't know LLDB's Python API,
> - that I'm not a Python programmer,
> - that the Python API documentation is pretty lacking in itself,
> - that I didn't implement support for ENABLE_CHECKING and what else
>   might change Lisp_Object layout
> 
> So please bear with me.
> 
> Anyway, at least displaying some Lisp_Objects with 'p obj' seems to
> work, and 'xbacktrace' seems to be working.

Thanks.  Feel free to install when you think this is ready.

Maybe also add a few words in etc/DEBUG about this.