[llvm] [LLVM][AArch64]Use load/store with consecutive registers in SME2 or S… (PR #77665)

[Sander de Smalen via llvm-commits]

sdesmalen-arm wrote:

I guess my point more widely was that when choosing a different calling convention (other than the one we currently implement), the choice of PN8 may not be right.

https://github.com/llvm/llvm-project/pull/77665