MPS native subrs (was: MPS make-thread)

[Helmut Eller]

On Sat, Jun 22 2024, Helmut Eller wrote:
>>> I thought native comp works for you?
>
> I haven't tried with the latest dump loading code.  I think that needs
> some work for native-comp-units.

Here are some patches for this.  I also have some questions:

1) In fix_subr, the &s->intspec.native field should only traced if the
   subr is a non-primitive.  Because, for primitives, it's a (possibly
   non-aligned) char*.  Right?

2) In dump_subr, the command_modes field is dumped with dump_field_lv
   for non-primitives but for primitives with dump_field_emacs_ptr.
   Is this intentional or a bug?

3) In fix_subr, why is the command_modes field only traced if
   HAVE_NATIVE_COMP?  (Today was the first time I heard of the
   command-modes function; still have no clue what it's used for :-)

0001-Add-some-checks-when-dumping-and-when-loading-the-du.patch
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0002-Support-dumping-native-subrs.patch
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0003-Only-GUI-versions-have-images-caches.patch
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