[MLIR] Fix AffineExpr getLargestKnownDivisor for ceildiv and floordiv
Fix AffineExpr `getLargestKnownDivisor` for ceil/floor div cases. In these cases, nothing can be inferred on the divisor of the result. Add test case for `mod` as well. Differential Revision: https://reviews.llvm.org/D112523
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