[llvm] [AArch64][SME2] Extend getRegAllocationHints for ZPRStridedOrContiguousReg (PR #119865)

[Sander de Smalen via llvm-commits]

https://github.com/sdesmalen-arm approved this pull request.

Please address the nits on the code comments, but otherwise LGTM.

https://github.com/llvm/llvm-project/pull/119865