[llvm] [AArch64] Add assembly/disassembly for BFMOP4{A,S} (non-widening) instructions (PR #113342)

[via llvm-commits]

https://github.com/CarolineConcatto commented:

Maybe we should add a commit message in this patch too.
The new instructions are described in
https://developer.arm.com/documentation/ddi0602/2024-09/SME-Instructions

https://github.com/llvm/llvm-project/pull/113342