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

[Pip Cet]

On Mon, May 25, 2020 at 6:40 AM Pip Cet <pipcet@gmail.com> wrote:
> We should also fix the (symbol-related) Emacs bug before it bites us:
> on both branches, unless we can get a mingw user to provide the output
> of "disassemble Fprog1" (and a bunch of other functions). (OTOH, we've
> already decided to keep crashable GC bugs on the emacs-27 branch).

And I just noticed strings aren't aligned to LISP_ALIGNMENT on
x86_64-pc-linux-gnu.

I think we're going to have to weaken the maybe_lisp_pointer check to
check only for GC_ALIGNMENT.

The commit that introduced this problem, for what it's worth, is
967d2c55ef3908fd378e05b2a0070663ae45f6de