[llvm] [llvm-c] Add LLVMDWARFTypeEncoding enum and update the MacInfo and callconv enum (PR #84456)

[Felipe de Azevedo Piovezan via llvm-commits]

felipepiovezan wrote:

> If NFC patch means a commit then i put it in its own commit, i think it should be ok now.

Note that this is not true for the github world: the commit will still get squashed upon merging, and will make history browsing difficult.
Usually NFC changes need to be in their _own PR_, not just their own commit

https://github.com/llvm/llvm-project/pull/84456