MDEV-15641 fixup: Make the test faster

Let us avoid the excessive allocation of explicit record locks
(a work-around of MDEV-24813) so that the test will execute
much faster under AddressSanitizer, MemorySanitizer, Valgrind.

mysql-test/suite/innodb/r/alter_large_dml.result

@@ -14,16 +14,10 @@ SET DEBUG_SYNC = 'now SIGNAL dml_pause';
 SET DEBUG_SYNC = 'now WAIT_FOR dml_restart';
 ROLLBACK;
 BEGIN;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
+INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_81920;
 ROLLBACK;
 BEGIN;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_114688;
 ROLLBACK;
 SET DEBUG_SYNC = 'now SIGNAL dml_done';
 connect con2, localhost,root,,test;

mysql-test/suite/innodb/t/alter_large_dml.test

@@ -25,17 +25,11 @@ SET DEBUG_SYNC = 'now WAIT_FOR dml_restart';
 ROLLBACK;
 
 BEGIN;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
-INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_16384;
+INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_81920;
 ROLLBACK;
 
 BEGIN;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT '','','','','','','','' FROM seq_1_to_114688;
 ROLLBACK;
 
 SET DEBUG_SYNC = 'now SIGNAL dml_done';