[llvm] [AArch64][CodeGen] Fix illegal register aliasing bug for mops instrs (PR #88869)

[Jack Styles via llvm-commits]

https://github.com/Stylie777 commented:

Are there any LLVM IR tests that can be added for this? As this is a CodeGen issue we should add these.

https://github.com/llvm/llvm-project/pull/88869