[llvm] Adding support in llvm-exegesis for Aarch64 for handling FPR64/128, PPR16 and ZPR128 reg class. (PR #127564)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

> thus for opcodes variants which used FPR64/128, PPR16 and ZPR128, llvm-exegesis throws error "setReg is not implemented"

I believe it is a warning - it still produces results when I've tried it in the past.

Can you add a test, and maybe fix the existing one for ADDXrr?

https://github.com/llvm/llvm-project/pull/127564