bug#34051: 27.0.50; Emacs 27 from master segfaults

[Eli Zaretskii]

> From: Stefan Husmann <stefan-husmann@t-online.de>
> Cc: 34051@debbugs.gnu.org
> Date: Sun, 13 Jan 2019 12:20:17 +0100
> 
> Hello, I had to recompile emacs without symbols stripped and here is the
> output:
> 
> emacs_backtrace
> ??:?
> terminate_due_to_signal
> ??:?
> emacs_abort
> ??:?
> message3_nolog
> ??:?
> message3
> ??:?
> Fmessage
> ??:?
> Ffuncall
> ??:?
> exec_byte_code
> ??:?
> Ffuncall
> ??:?
> exec_byte_code
> ??:?
> Ffuncall
> ??:?
> exec_byte_code
> ??:?
> funcall_lambda
> eval.c:?
> Ffuncall
> ??:?
> funcall_nil
> eval.c:?
> run_hook_with_args
> ??:?
> run_hook
> ??:?
> Fkill_emacs
> ??:?
> x_connection_closed
> xterm.c:?
> x_error_quitter.isra.52
> xterm.c:?
> x_error_handler
> xterm.c:?
> ??
> ??:0
> ??
> ??:0
> ??
> ??:0
> ??
> ??:0
> ??
> ??:0
> x_parse_color
> ??:?
> x_defined_color
> ??:?

Strange, it looks like it dies in x_parse_color.  Alan, can you
reproduce this?