[SCEV] Check `Pred` first in isKnownPredicateViaSplitting

Comparing `Pred` with `ICmpInst::ICMP_ULT` is cheaper that memory access
-- do that check before loading / storing `ProvingSplitPredicate`.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@249654 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed