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556e0d5173
Replace the check for poison-producing instructions in SimplifyWithOpReplaced() with the generic helper canCreatePoison() that properly handles poisonous shifts and thus avoids the problem from PR47322. This additionally fixes a bug in IIQ.UseInstrInfo=false mode, which previously could have caused this code to ignore poison flags. Setting UseInstrInfo=false should reduce the possible optimizations, not increase them. This is not a full solution to the problem, as poison could be introduced more indirectly. This is just a minimal, easy to backport fix. Differential Revision: https://reviews.llvm.org/D86834