Method set_max_count

external/parallel_hashmap/btree.h:1166–1166

        void set_start(field_type v)       { GetField<1>()[1] = v; }
        void set_count(field_type v)       { GetField<1>()[2] = v; }
        void set_max_count(field_type v)   { GetField<1>()[3] = v; }

    public:
        // Whether this is a leaf node or not. This value doesn't change after the