[llvm] [X86] Check MinMax has NaN and replace with NewX for minimumnum/maximumnum (PR #164546)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> Thanks @phoebewang, this PR can fix the failing tests in [intel/llvm#20402](https://github.com/intel/llvm/pull/20402)

Thanks for the check @wenju-he! Sorry, I just have an idea to optimize the implementation. Could you help check it again? Thanks!

https://github.com/llvm/llvm-project/pull/164546