[SelectionDAG] Handle more opcodes in isGuaranteedNotToBeUndefOrPoison (#147019) Add special handling of EXTRACT_SUBVECTOR, INSERT_SUBVECTOR, EXTRACT_VECTOR_ELT, INSERT_VECTOR_ELT and SCALAR_TO_VECTOR in isGuaranteedNotToBeUndefOrPoison. Make use of DemandedElts to improve the analysis and only check relevant elements for each operand. Also start using DemandedElts in the recursive calls that check isGuaranteedNotToBeUndefOrPoison for all operands for operations that do not create undef/poison. We can do that for a number of elementwise operations for which the DemandedElts can be applied to every operand (e.g. ADD, OR, BITREVERSE, TRUNCATE).
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