bug#34655: 26.1.92; Segfault in module with --module-assertions

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Thu, 21 Mar 2019 17:11:41 +0100
> Cc: "Basil L. Contovounesios" <contovob@tcd.ie>, 34655@debbugs.gnu.org
> 
> I haven't checked everything in detail, but my impression is that this
> is rather another instance of bug#31238. Fixing this only when module
> assertions are enabled will probably not fix anything, but rather mask
> issues. Reverting commit 3eb93c07f7a60ac9ce8a16f10c3afd5a3a31243a is
> still the right approach here. Can you please hold off a bit? I've
> almost completed the revert, but haven't pushed it yet. Once that's in
> we can check whether it also fixes this issue.

I will CC Stefan, who committed 3eb93c07f7a60ac9ce8a16f10c3afd5a3a31243a.

I'm not sure we should revert that; we could instead add GC protection
for those parts that need it.  And the list consed by
module-assertions certainly is one of those.