bug#36649: 27.0.50; pure space and pdumper

[Eli Zaretskii]

> From: Pip Cet <pipcet@gmail.com>
> Date: Sat, 2 Jul 2022 08:55:46 +0000
> Cc: Eli Zaretskii <eliz@gnu.org>, 36649@debbugs.gnu.org
> 
> On Fri, Jul 1, 2022 at 6:58 PM Stefan Monnier <monnier@iro.umontreal.ca> 
> wrote:
> > >> That means keeping purespace and hence not applying the patch.
> > >> Why would we want to keep purespace in the unexec build?
> > > This was discussed at length, I think in this bug as well.
> > I've seen it stated in this thread, but never explained, no.
> 
> FWIW, I don't recall any reason why it shouldn't work with unexec,
> either. To the best of my recollection, unexec was generally broken at
> the time I wrote the patch; I fixed unexec and then it worked without
> purespace, but the unexec fixes never made it into master until Eli
> re-did them a while later.

Basically, I don't want us to drop the pure space in the unexec
builds, whether it makes sense to the rest of you or not.  So there
are two alternatives: either drop pure space only for the pdumper
build, or wait for us to remove the unexec support and drop pure space
then.