[llvm] [AMDGPU][InstCombine] Add sudot zero/constant folding tests. NFC (PR #225321)

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@llvm/pr-subscribers-llvm-transforms

Author: Harrison Hao (harrisonGPU)

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Full diff: https://github.com/llvm/llvm-project/pull/225321.diff


1 Files Affected:

- (added) llvm/test/Transforms/InstCombine/AMDGPU/llvm.amdgcn.sudot.ll (+114) 


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https://github.com/llvm/llvm-project/pull/225321