[clang] [llvm] [HLSL][SPIRV]Add SPIRV generation for HLSL dot (PR #104656)

[Greg Roth via cfe-commits]

pow2clk wrote:

> could you fixup normalize to use the fdot expansion?
> 
> https://github.com/llvm/llvm-project/blob/9cf27a4d8b1da0e7b51eacb9fb6096155c294d3f/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp#L278-L289

It makes the signature a bit unusual, but it works!

https://github.com/llvm/llvm-project/pull/104656