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8272b6bd61
Fixes an issue where the `SimpleAffineExprFlattener` would simplify `lhs % rhs` to just `-(lhs floordiv rhs)` instead of `lhs - (lhs floordiv rhs)` if `lhs` happened to be equal to `lhs floordiv rhs`. The reported failure case was `(d0, d1) -> (((d1 - (d1 + 2)) floordiv 8) % 8)` from https://github.com/llvm/llvm-project/issues/114654. Note that many paths that simplify AffineMaps (e.g. the AffineApplyOp folder and canonicalization) would not observe this bug because of of slightly different paths taken by the code. Slightly different grouping of the terms could also result in avoiding the bug. Resolves https://github.com/llvm/llvm-project/issues/114654.