IR: handle FP predicates in CmpPredicate::getMatching (#122924) CmpPredicate::getMatching implicitly assumes that both predicates are integer-predicates, and this has led to a crash being reported in VectorCombine after e409204 (VectorCombine: teach foldExtractedCmps about samesign). FP predicates are simple enough to handle as there is never any samesign information associated with them: hence handle them in CmpPredicate::getMatching, fixing the VectorCombine crash and guarding against future incorrect usages.
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