[llvm] [DAG] Use UndefPoisonKind enum in isGuaranteedNotToBeUndefOrPoison/canCreateUndefOrPoison (PR #196145)

[Simon Pilgrim via llvm-commits]

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@@ -2571,7 +2571,9 @@ SDValue SelectionDAG::getFreeze(SDValue V) {
 
 SDValue SelectionDAG::getFreeze(SDValue V, const APInt &DemandedElts,
                                 bool PoisonOnly) {
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RKSimon wrote:

@bjope Is there any case where we'd want getFreeze to be UndefOnly?

https://github.com/llvm/llvm-project/pull/196145