[llvm] [AArch64] Separate PNR into its own Register Class (PR #65306)

[Sander de Smalen via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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sdesmalen-arm wrote:

I would have expected PPRtoPNRCopy.mir to be almost the same as PNRtoPPRCopy.mir, with the PN and P swapped. Was there a reason that you couldn't construct such a test?

https://github.com/llvm/llvm-project/pull/65306