[clang] [llvm] [mlir] [x86][AVX-VNNI] Fix VPDPBXXD Argument Type (PR #159222)

[Thurston Dang via cfe-commits]

https://github.com/thurstond commented:

I approve of the MemorySanitizer-related portion of this pull request. (The rest of the change looks reasonable to me but I'll defer to the code owners / experts.) Thanks for adding the intrinsic cases and updating the test files :-).

https://github.com/llvm/llvm-project/pull/159222