Set new scheduling algorithm VATS for lock waits as a default.

mysql-test/suite/sys_vars/r/sysvars_innodb.result

@@ -1449,9 +1449,9 @@ READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	NONE
 VARIABLE_NAME	INNODB_LOCK_SCHEDULE_ALGORITHM
 SESSION_VALUE	NULL
-GLOBAL_VALUE	fcfs
+GLOBAL_VALUE	vats
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	fcfs
+DEFAULT_VALUE	vats
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	ENUM
 VARIABLE_COMMENT	The algorithm Innodb uses for deciding which locks to grant next when a lock is released. Possible values are FCFS grant the locks in First-Come-First-Served order; VATS use the Variance-Aware-Transaction-Scheduling algorithm, which uses an Eldest-Transaction-First heuristic.

storage/innobase/handler/ha_innodb.cc

@@ -22808,7 +22808,7 @@ static MYSQL_SYSVAR_ENUM(lock_schedule_algorithm, innodb_lock_schedule_algorithm
   " VATS"
   " use the Variance-Aware-Transaction-Scheduling algorithm, which"
   " uses an Eldest-Transaction-First heuristic.",
-  NULL, NULL, INNODB_LOCK_SCHEDULE_ALGORITHM_FCFS,
+  NULL, NULL, INNODB_LOCK_SCHEDULE_ALGORITHM_VATS,
   &innodb_lock_schedule_algorithm_typelib);
 
 static MYSQL_SYSVAR_ULONG(buffer_pool_instances, srv_buf_pool_instances,