[llvm] [DebugInfo][RemoveDIs] Instrument loop-rotate for DPValues (PR #72997)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

Not-quite-LGTM, due to my own confusion on what cloneDebugInfoFrom is doing (see inline comment).

https://github.com/llvm/llvm-project/pull/72997