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

[Eli Zaretskii]

> Cc: pipcet@gmail.com, 41321@debbugs.gnu.org, monnier@iro.umontreal.ca
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Sat, 30 May 2020 10:06:35 -0700
> 
> On 5/30/20 9:42 AM, Eli Zaretskii wrote:
> >> That's not correct for !USE_LSB_TAG, where LISP_ALIGNMENT is merely the 
> >> native
> >> alignment (there's no need to align objects to 8 because the tags are at 
> >> the
> >> high end).
> > I'm using a !USE_LSB_TAG build, but LISP_ALIGNMENT is 8 nonetheless.
> 
> That's true for your platform, since alignof (max_align_t) == 8 on your
> platform.

No, it's 16.  And I don't understand what does that have to do with
LISP_ALIGNMENT on the master branch, since we all but removed
max_align_t from there.