[PredicateInfo] Don't use depth first walk (NFCI) (#145016) The order in which we collect the predicates does not matter, as they will be sorted anyway. As such, avoid the expensive depth first walk over the dominator tree and instead use plain iteration over the function. (To be a bit more precise, the predicates and uses for a specific value are sorted, so this change has no impact on that. It can change the order in which values are processed in the first place, but that order is not semantically relevant.)
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