bug#34394: 27.0.50; Emacs segfaults with SLY, company and C-g

[Eli Zaretskii]

> From: João Távora <joaotavora@gmail.com>
> Cc: 34394@debbugs.gnu.org,  schwab@linux-m68k.org
> Date: Sat, 09 Feb 2019 11:31:36 +0000
> 
> > I meant to ask that you examine the value in GDB.  Sorry if I didn't
> > make that clear enough.
> 
> Oh, silly, sorry.  But I still can't answer, because it can't find that
> symbol in context.
> 
> I tried just 'p Vquit_flag'

Type "up" until you get into a call-stack frame in our sources, which
should be this:

  #7  0x00005555556b22d4 in quit_throw_to_read_char 
(from_signal=from_signal@entry=false) at keyboard.c:10486

Then just "p Vquit_flag" should do.  Yes, it is a global.