5351     auto Subset = ArrayRef<InstructionVFPair>();  in selectVectorizationFactor()  local
5353       if (Subset.empty())  in selectVectorizationFactor()
5354         Subset = Tail.take_front(1);  in selectVectorizationFactor()
5356       Instruction *I = Subset.front().first;  in selectVectorizationFactor()
5363       if (Subset == Tail || Tail[Subset.size()].first != I) {  in selectVectorizationFactor()
5366         assert(!Subset.empty() && "Unexpected empty range");  in selectVectorizationFactor()
5368         for (auto &Pair : Subset)  in selectVectorizationFactor()
5369           OS << (Pair.second == Subset.front().second ? "" : ", ")  in selectVectorizationFactor()
5378         Tail = Tail.drop_front(Subset.size());  in selectVectorizationFactor()
5379         Subset = {};  in selectVectorizationFactor()
5382         Subset = Tail.take_front(Subset.size() + 1);  in selectVectorizationFactor()