btf__add_array
LIBBPF_API int btf__add_array(struct btf *btf,
new_array_id = btf__add_array(btf, array->index_type, array->type, nr_elements);
btf__add_array(btf1, 1, 1, 3); /* [15] int [3]; */
array_id = btf__add_array(t.btf, int_id, char_id, 4);
btf__add_array(btf, 1, 2, 3); /* [4] int64[3] */
id = btf__add_array(btf, 1, 2, 10); /* int *[10] */