[clang] [llvm] [X86][AVX10.2] Decouple AMX-AVX512 from AVX10.2 (PR #148633)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> TBH I'm not sure if we need to add `avx512f,evex512` to intrinsics attributes and/or to `.td` as well.

Yes, we need them for now. Otherwise, we cannot allocate ZMM registers.

https://github.com/llvm/llvm-project/pull/148633