successor_iterator  981 src/hydrogen.cc     successor_iterator = HSuccessorIterator(block_->end());
successor_iterator  985 src/hydrogen.cc     if (!successor_iterator.Done()) {
successor_iterator  986 src/hydrogen.cc       HBasicBlock* result = successor_iterator.Current();
successor_iterator  987 src/hydrogen.cc       successor_iterator.Advance();
successor_iterator 1017 src/hydrogen.cc   HSuccessorIterator successor_iterator;