bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Eli Zaretskii]

> From: Paul Eggert <eggert@cs.ucla.edu>
> Cc: 41321@debbugs.gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Mon, 25 May 2020 23:46:02 -0700
> 
> I propose the second patch for emacs-27; it's limited to what you proposed,
> namely, it weakens maybe_lisp_pointer to check only for GC_ALIGNMENT.
> 
>  static bool
>  maybe_lisp_pointer (void *p)
>  {
> -  return (uintptr_t) p % LISP_ALIGNMENT == 0;
> +  return (uintptr_t) p % GCALIGNMENT == 0;
>  }

On non-USE_LSB_TAG systems, GCALIGNMENT is 1, so this doesn't look
right (or maybe I'm missing something).