Removed non-generic info (key used blocks)
preload.result, preload.test, lex.h, sql_yacc.yy:
  Syntax change for preload statement


sql/sql_yacc.yy:
  Syntax change for preload statement
sql/lex.h:
  Syntax change for preload statement
mysql-test/t/preload.test:
  Removed non-generic info (key used blocks)
mysql-test/r/preload.result:
  Removed non-generic info (key used blocks)