Reapply "[SCEV] Fold (C1 * A /u C2) -> A /u (C2 /u C1), if C2 > C1." (#158328) This reverts commit fd58f235f8c5bd40d98acfd8e7fb11d41de301c7. The recommit contains an extra check to make sure that D is a multiple of C2, if C2 > C1. This fixes the issue causing the revert fd58f235f8c. Tests have been added in 6a726e9a4d3d0. Original message: If C2 >u C1 and C1 >u 1, fold to A /u (C2 /u C1). Depends on https://github.com/llvm/llvm-project/pull/157555. Alive2 Proof: https://alive2.llvm.org/ce/z/BWvQYN PR: https://github.com/llvm/llvm-project/pull/157656
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