[llvm] [DebugInfo][LoopDistribute] Salvage debug values using dead instructions in the distributed loops (PR #137124)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

Sorry @Apochens, it got lost in the github notifications. 

Would it be possible to reduce the test case a bit? If the `dbg_value` s are all testing the same code path then just one is sufficient for the test. And if we can reduce the number of instructions too, that will help future maintainers understand what's going on.

Otherwise SGTM

https://github.com/llvm/llvm-project/pull/137124