nvptx, libgfortran: Switch out of "minimal" mode

[Thomas Schwinge]

Hi!

On 2023-01-20T22:04:02+0100, I wrote:
> We've been (t)asked to enable (portions of) GCC/Fortran I/O for nvptx
> offloading, which means building a normal (non-'LIBGFOR_MINIMAL')
> configuration of libgfortran.

This is achieved by 'nvptx, libgfortran: Switch out of "minimal" mode',
see attached, again based on WIP work by Andrew Stubbs.  This I've just
pushed to devel/omp/gcc-12 branch in
commit c7734c6fbb5513b4da6306de7bc85de9b8547988, and would like to push
to master branch once other pending GCC patches have been accepted.


The OpenACC XFAILs: "[...] overflows the stack for nvptx offloading"
are unresolved at this point; see the discussion around
"Handling of large stack objects in GPU code generation -- maybe transform into heap allocation?",
and my "nvptx: '-mframe-malloc-threshold', '-Wframe-malloc-threshold'"
experimenting.  (The latter works to some extent, but also has other
issues that I shall detail at some later point in time.)


Grüße
 Thomas


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