[llvm] [llvm] Fix crash when complex deinterleaving operates on an unrolled loop (PR #129735)

[Sander de Smalen via llvm-commits]

https://github.com/sdesmalen-arm commented:

While I was able to spot some issues, it's probably better if someone with more experience in this pass has a look at it as well.

https://github.com/llvm/llvm-project/pull/129735