[clang] [llvm] [HLSL][DXIL][SPIRV] QuadReadAcrossDiagonal intrinsic support (PR #188567)

[Justin Bogner via cfe-commits]

https://github.com/bogner approved this pull request.

This has been sitting for a while - do you need somebody to merge it for you?

I think you've made enough changes that folks were assuming you have commit access at this point - you can feel free to request it following the guidelines here: https://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access. Feel free to CC me to give an approval.

https://github.com/llvm/llvm-project/pull/188567