[llvm] [DLCov][NFC] Propagate annotated DebugLocs through transformations (PR #138047)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

> I think this comment still stands

I'm on the fence - this is a function that may be used outside of LLVM itself, and there may be legitimate use cases for it. My personal preference would be to do that separately in case there are associated issues with removing it, so that this patch overall doesn't depend on that change.

https://github.com/llvm/llvm-project/pull/138047