[clang] [llvm] [HLSL][DXIL][SPIRV] QuadReadAcrossX intrinsic support (PR #184360)

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kcloudy0717 wrote:

Tagging @farzonl and @bob80905 for review. A question: who should I tag to review the SPIRV-related changes? I added some more changes than usual in the SPIRV backend and need someone from SPIRV to make sure the changes are good.

https://github.com/llvm/llvm-project/pull/184360