[llvm] llvm-c: Introduce 'LLVMDISubprogramReplaceType' (PR #143461)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams approved this pull request.

The test update LGTM. If @dwblaikie has no further comments, I can merge this for you if you don't have commit access?

https://github.com/llvm/llvm-project/pull/143461