by the patch for Bug#4968


sql/sql_parse.cc:
  Fix lowercase_tables2 test failure on powermacg5: table_case_name()
  function needed create_info.alias if lowercase_table_names=2, which
  was not set for the stack copy of HA_CREATE_INFO. Move the
  update of create_info.alias from create_table_precheck to 
  mysql_execute_command, so that it is done on the right object.