MDEV-14100 Assertion `!is_user_rec || leaf || ...

rec_get_offsets_func(): Relax a bogus debug assertion.
It would fail when we are operating on a copied prefix
of a node pointer record.

Author: dr-m

storage/innobase/rem/rem0rec.cc

@@ -594,6 +594,7 @@ rec_get_offsets_func(
 		ut_ad(is_user_rec || n == 1);
 		ut_ad(!is_user_rec || leaf || index->is_dummy
 		      || dict_index_is_ibuf(index)
+		      || n == n_fields /* dict_stats_analyze_index_level() */
 		      || n
 		      == dict_index_get_n_unique_in_tree_nonleaf(index) + 1);
 		ut_ad(!is_user_rec || !leaf || index->is_dummy