[llvm] [AArch64] Initial sched model for Neoverse N3 (PR #106371)

[via llvm-commits]

FLZ101 wrote:

> Hello. The other thing that came up from talking to internal colleagues was whether we have any evidence that this scheduling model is working well and reflecting the real hardware. Have you run any performance data or even have you looked into calibrating against the latencies/throughputs produced from hardware?

I have no N3 machine. I just "translate" the N3 SWOG into a sched model.

https://github.com/llvm/llvm-project/pull/106371