[SCEV] Store predicates for EL/ENT in SmallVector. Store predicates in ExitLimit and ExitNotTaken in a SmallVector instead of a SmallPtrSet. This guarantees the predicates can be iterated on in a predictable manner. This ensures the predicates can be printed and generated in a predictable order. This shifts de-duplication of predicates to construction time for ExitLimit. ExitNotTaken just takes predicates from ExitLimit, so they should also be free of duplicates. This was exposed by 2f7ccaf4a8565628a4c7d2b5a49bb45478940be6 (https://github.com/llvm/llvm-project/pull/108777). Should fix https://lab.llvm.org/buildbot/#/builders/110/builds/1494.
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