[llvm] Implement a custom stream for LDBG macro to handle newlines (PR #150750)

[Jacques Pienaar via llvm-commits]

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

I was thinking about this one, it changes the output a bit more than the previous, but it does match one of my previous logging libs I used so biasedly like it. 

https://github.com/llvm/llvm-project/pull/150750