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When there is obvious UB involved in the process of re-associating a series of IV increments to build up a CHREC, fail. This catches a few degenerate cases where SCEV introduces UB with its inherent re-associating of IV increments. PR tree-optimization/121370 * tree-scalar-evolution.cc (scev_dfs::add_to_evolution_1): Avoid UB integer overflow in accumulating CHREC_RIGHT. * gcc.dg/torture/pr121370.c: New testcase.
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