[llvm] [X86] Support lowering of FMINIMUMNUM/FMAXIMUMNUM (PR #121464)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> @arsenm I saw 3 failures in check-all, could you please take a look? Thanks!
> 
> ```
> Failed Tests (3):
>   LLVM :: CodeGen/AArch64/fp-maximumnum-minimumnum.ll
>   LLVM :: CodeGen/AMDGPU/maximumnum.ll
>   LLVM :: CodeGen/AMDGPU/minimumnum.ll
> ```

What happens to the codegen if you regenerate the checks?

https://github.com/llvm/llvm-project/pull/121464