[clang] [compiler-rt] [llvm] [X86] Add missing checks for attribute target testing and support AVX5124VNNIW/4FMAPS in compiler-rt (PR #218697)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

> I thought KNM specific ISAs were removed in https://github.com/llvm/llvm-project/pull/93136? Why did that PR miss these?

This was my understanding as well. I think not having knm/knl support is intentional.

https://github.com/llvm/llvm-project/pull/218697