[llvm] [DebugInfo][InstCombine] When replacing bswap idiom, add DebugLoc to new insts (PR #114231)

[Adrian Prantl via llvm-commits]

adrian-prantl wrote:

@SLTozer Can you propose a patch to https://llvm.org/docs/HowToUpdateDebugInfo.html#when-to-merge-instruction-locations?

https://github.com/llvm/llvm-project/pull/114231