[clang] [llvm] [HLSL][DXIL][SPRIV] Added WaveActiveProduct intrinsic #164385 (PR #165109)

[Steven Perron via llvm-commits]

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s-perron wrote:

Why did you make this intrinsic so specific when the instruction is more general? Could we make the scope and group operation parameters?

We will have to generate similar instructions eventually: 

https://github.com/search?q=repo%3Amicrosoft%2FDirectXShaderCompiler%20OpGroupNonUniformIMul&type=code

https://github.com/llvm/llvm-project/pull/165109