[Bug default/25449] Factor out compilation units

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25449

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #2)
> So, the jist of this seems to be:
> - factored out partial unit: needs import
> - factored out compilation unit:
>   - prudent to import from C compilation unit (but we can have f.i. a
>     command line option to not do this, and see what breaks)

Alternatively, we can try to prove we don't need the import.  If the all the
elements in the factored out compilation unit are uniquely named in link scope,
there's no confusion about which is meant, and we don't need the import.

>   - not required from C++ compilation unit

Conversely, this may cause problems because there may be different DIEs with
the same globally unique name which are not structurally equivalent. This
happens for instance with member function templates, where a DIE in one CU
representing a named struct can have extra members representing the various
member function template instantiations in the CU, making the DIE potentially
different from other DIEs representing the same named struct in other CUs. [
Which is why we want a --odr-mode=unify option. ]

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