bug#46256: [feature/native-comp] AOT eln files ignored if run from build tree

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: Pip Cet <pipcet@gmail.com>, 46256@debbugs.gnu.org,
>         andrewjmoreton@gmail.com
> Date: Mon, 08 Mar 2021 18:15:21 +0000
> 
> >   From        To          Syms Read   Shared Object Library
> >   0x6a581000  0x6a5bacd8  Yes         
> > d:\usr\eli\.emacs.d\eln-cache\28.0.50-19fa14f1\cc-align-bb265728-bd3550a3.eln
> >
> > whose address is 4KB higher.  That probably means the CU represented
> > by comp_u was unloaded, right?
> 
> I guess this suggests 0x6a580000 was a previously infact a mapped eln
> that got unmapped.

Can you tell why are we loading the same .eln files more than once?
What are the reasons for unloading a .eln file which was once loaded
into a session?