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

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https://github.com/Lukacma approved this pull request.

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

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