[HLSL] Add matrix support to atan2 (#194984)
This patch updates atan2 hlsl intrinsic overloads to support matrix
types.
Fix: https://github.com/llvm/llvm-project/issues/184476
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Co-authored-by: Deric C. <cheung.deric@gmail.com>
Co-authored-by: Farzon Lotfi <farzonl@gmail.com>
