[clang] [llvm] [DebugInfo] Update DIBuilder insertion to take InsertPosition (PR #126059)

[Orlando Cazalet-Hyams via cfe-commits]

https://github.com/OCHyams commented:

> @OCHyams I believe you did the C API changes, are there any additional concerns in this area?

SGTM, just one inline question

https://github.com/llvm/llvm-project/pull/126059