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

[Joshua Batista via cfe-commits]

bob80905 wrote:

> The SPIR-V code looks good. Just update the test to target vulkan 1.3 and use the target env when calling spirv-val.

Just curious here, why isn't this a case where we'd add the scalar block layout option?

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