MDEV-33251 Redundant check on prebuilt::n_rows_fetched overflow

row_search_mvcc(): Revise an overflow check, disabling it on 64-bit
systems. The maximum number of consecutive record reads in a key range
scan should be limited by the maximum number of records per page
(less than 2^13) and the maximum number of pages per tablespace (2^32)
to less than 2^45. On 32-bit systems we can simplify the overflow check.

Reviewed by: Vladislav Lesin

storage/innobase/row/row0sel.cc

@@ -4406,13 +4406,11 @@ row_search_mvcc(
 			goto func_exit;
 		}
 
+#if SIZEOF_SIZE_T < 8
+		if (UNIV_LIKELY(~prebuilt->n_rows_fetched))
+#endif
 		prebuilt->n_rows_fetched++;
 
-		if (prebuilt->n_rows_fetched > 1000000000) {
-			/* Prevent wrap-over */
-			prebuilt->n_rows_fetched = 500000000;
-		}
-
 		mode = pcur->search_mode;
 	}