def split_old_bin(table, new_table, i, node, node_hash, forwarder)
      table.try_lock_via_hash(i, node, node_hash) do
        split_bin(new_table, i, node, node_hash)
        table.volatile_set(i, forwarder)
      end
    end
def split_old_bin(table, new_table, i, node, node_hash, forwarder)
      table.try_lock_via_hash(i, node, node_hash) do
        split_bin(new_table, i, node, node_hash)
        table.volatile_set(i, forwarder)
      end
    end
Splits a normal bin with list headed by e into lo and hi parts; installs in given table.