[llvm] [AArch64] Add assembly/disassembly of FMOP4{A,S} (non-widening) single-precision instructions (PR #113344)

[Momchil Velikov via llvm-commits]

momchil-velikov wrote:

> LGTM. The only thing is that maybe the commit message should be updated, as this patch also adds half-precision instructions.

It's all right, this PR is on top of another PR for half-prec, they are going to be committed separately (and the following one for double-prec)

https://github.com/llvm/llvm-project/pull/113344