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[MLIR][Presburger] subtract: fix support for divs defined by equalities
Also added test cases to test this. Both IntegerRelation::addLocalFloorDiv and the fixed implementation of subtraction need to compute division inequalities from dividend and divisor, so this also adds helper util functions to avoid duplicating this logic. Reviewed By: Groverkss Differential Revision: https://reviews.llvm.org/D128736
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