[llvm] Add debuginfo C support for a SetType, Subrangetype, dynamic array type and replace arrays (PR #135607)

[Tom Tromey via llvm-commits]

tromey wrote:

> I have modified the header to mention which parameters are not null and tested the rest which can safely be null.

It seems a bit strange to require those in particular to be non-null, because they're really only useful for Fortran.

https://github.com/llvm/llvm-project/pull/135607