[llvm] [RemoveDIs] C API: Add before-dbg-record versions of IRBuilder position funcs (PR #92417)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

Rebase + fix typo. I'll land this shortly.

Thanks both for your patience and reviews.

https://github.com/llvm/llvm-project/pull/92417