Fixed BUG#19727 "InnoDB crashed server and crashed tables
 are not recoverable".


innobase/row/row0mysql.c:
  Applied innodb-5.0-ss609 snapshot.
   Move trx_commit_for_mysql(trx) calls before calls to
   row_mysql_unlock_data_dictionary(trx).
innobase/row/row0sel.c:
  Applied innodb-5.0-ss609 snapshot.
   row_sel_try_search_shortcut(): Do not return SEL_FOUND when
   the record was not found. This bug was introduced in
   InnoDB 5.0.3, but luckily it should nerver manifest itself,
   given that existing InnoDB SQL code never makes use of
   consistent reads.
mysql-test/t/innodb.test:
  Applied innodb-5.0-ss609 snapshot.
   Add the big fat warning notice also to the bottom of
   innodb.test so that it will require more talent to
   ignore the change of policy.