Do not use page_cur_search_with_match_bytes() for comparing MIN_REC_FLAG

The 'default row' record (which is the only search tuple and the only
leaf-page record that carries the REC_INFO_MIN_REC_FLAG)  must be searched
by using the conventional means. Do not slow down the search shortcut by
taking the MIN_REC_FLAG into account.

storage/innobase/btr/btr0cur.cc

@@ -1589,6 +1589,7 @@ btr_cur_search_to_nth_level(
 		}
 #ifdef BTR_CUR_HASH_ADAPT
 	} else if (height == 0 && btr_search_enabled
+		   && !(tuple->info_bits & REC_INFO_MIN_REC_FLAG)
 		   && !dict_index_is_spatial(index)) {
 		/* The adaptive hash index is only used when searching
 		for leaf pages (height==0), but not in r-trees.

storage/innobase/page/page0cur.cc

@@ -599,6 +599,7 @@ page_cur_search_with_match_bytes(
 	rec_offs_init(offsets_);
 
 	ut_ad(dtuple_validate(tuple));
+	ut_ad(!(tuple->info_bits & REC_INFO_MIN_REC_FLAG));
 #ifdef UNIV_DEBUG
 # ifdef PAGE_CUR_DBG
 	if (mode != PAGE_CUR_DBG)