[llvm] [DebugInfo][ConstraintElimination] Fix debug value loss in replacing comparisons with the speculated constants (PR #136839)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

(Still LGTM - I think this is good to merge now)

https://github.com/llvm/llvm-project/pull/136839