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

[peter mckinna via llvm-commits]

demoitem wrote:

I had another look after that query about Fortran and changed the unwrap to unwrapDI for those parameters
and now they support null values. I'm not an expert on unwrapping and am mostly confused about the whole
business. I just want C access to these functions. Anyway it seems to be working properly and the test show
that. If there are no other issues can someone merge this? Thanks.

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