[clang] [Clang][AArch64] Add fp8 variants for untyped NEON intrinsics (PR #128019)

[via cfe-commits]

Lukacma wrote:

I have adjusted NeonEmitter to automatically emit correct attribute for mfloat8 intrinsics and merged them to the original record.

https://github.com/llvm/llvm-project/pull/128019