There is no reason for the dummy index object dict_ind_redundant
to exist any more. It was only being passed to btr_create().

btr_create(): If !index, assume that a ROW_FORMAT=REDUNDANT
table is being created.

We could pass ibuf.index, dict_sys.sys_tables->indexes.start
and so on, if those objects had been initialized before the
function btr_create() is called.