[llvm] [DEBUGINFO] Propagate debug metadata for sext SDNode. (PR #135971)

[Orlando Cazalet-Hyams via llvm-commits]

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

Great, this LGTM (with a final nit, but feel free to merge once that's fixed). Thanks!

https://github.com/llvm/llvm-project/pull/135971