[clang] [llvm] [AArch64] Add 9.7 CVT data processing intrinsics (PR #186807)

[via llvm-commits]

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Lukacma wrote:

```suggestion
   def int_aarch64_sve_fcvtzsn_x2: AdvSIMD_2Arg_FloatCompare_Intrinsic;
   def int_aarch64_sve_fcvtzun_x2: AdvSIMD_2Arg_FloatCompare_Intrinsic;
```

https://github.com/llvm/llvm-project/pull/186807