[clang] [llvm] [DirectX] Use scalar arguments for @llvm.dx.dot intrinsics (PR #134570)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

There is a `dot2add.c` test case you will need to update. Target builtins are suppose to work across language modes.

https://github.com/llvm/llvm-project/pull/134570