Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch


sql/ha_innodb.cc:
  Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch
innobase/include/row0mysql.h:
  Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch
innobase/row/row0mysql.c:
  Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch