[clang] [llvm] [HLSL][DXIL][SPIRV] Create llvm dot intrinsic and use for HLSL (PR #102872)

[Thorsten Schütt via cfe-commits]

tschuett wrote:

Please update the https://github.com/llvm/llvm-project/blob/main/llvm/lib/CodeGen/MachineVerifier.cpp to protect against misuse.

https://github.com/llvm/llvm-project/pull/102872