[llvm] [AArch64] Initial sched model for Neoverse V3, V3AE (PR #163932)

[Cullen Rhodes via llvm-commits]

https://github.com/c-rhodes approved this pull request.

LGTM cheers

it is a bit of a shame there's so much duplication when these models are more common than not, most of the differences seems to stem from V3AE having 2 less vector pipes, but I guess that also applies across other neoverse models and fixing it would take a fair bit of refactoring

https://github.com/llvm/llvm-project/pull/163932