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D152730 may add trivial pre-conditions of the form (ICMP_ULE, 0, B), which won't be handled automatically by the constraint system, because we don't add Var >= 0 for all variables in the unsigned system. Handling the trivial condition explicitly here avoids having the increase the number of rows in the system per variable. https://alive2.llvm.org/ce/z/QC92ur Depends on D152730. Fixes #63125. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158776