[Fortran, Patch, PR107635, 4_v1] Fix class type and descriptor handling for new coarray interface [PR107635]

[Andre Vehreschild]

Hi all,

during testing and compiling some larger coarray codes, I found a few
deficiencies. One was with handling class types when splitting the coarray
expression and the other was that the backend_decl of a formal argument in a
function's symbol was not the same as the one the function was compiled to. So
looking at the function-decl's tree n-th formal argument is the way to go there.

Regtests ok on x86_64-pc-linux-gnu / F41. Ok for mainline?

Regards,
	Andre
--
Andre Vehreschild * Email: vehre ad gmx dot de
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