[llvm] AArch64: Mark the dead status flag clobbers in the SME ABI pass (PR #228042)

[Benjamin Maxwell via llvm-commits]

https://github.com/MacDue commented:

I think this is likely an issue with the instruction definitions. I don't think `MSRpstatesvcrImm11` actually defines the status flags. 

https://github.com/llvm/llvm-project/pull/228042