bug#36649: 27.0.50; pure space and pdumper

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Date: Mon, 22 Jul 2019 10:14:47 +0200
> Cc: 36649@debbugs.gnu.org, Paul Eggert <eggert@cs.ucla.edu>
> 
> >>>>> On Mon, 22 Jul 2019 03:58:29 +0000, Pip Cet <pipcet@gmail.com> said:
> 
>     Pip> On Sun, Jul 21, 2019 at 8:20 PM Robert Pluim <rpluim@gmail.com> 
> wrote:
>     Pip> Can you try again with this incremental patch?
>     >> 
>     >> I offer two alternatives, both of which build and run:
> 
>     Pip> Oops, sorry. I think the second alternative might break
>     Pip> live_vector_holding, though?
> 
> OK. Hereʼs hoping no other code in emacs tries to create a 0-length
> vector :-)

I think font.c (or fontset.c?) does.