Add strict check to phpass's CheckPassword() method to avoid issues when the method is improperly called.

Merges [24457] to the 3.5 branch.



git-svn-id: https://core.svn.wordpress.org/branches/3.5@24458 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Have wpdb::flush() reset more variables.

Merges [24459] to the 3.5 branch.



git-svn-id: https://core.svn.wordpress.org/branches/3.5@24460 1a063a9b-81f0-0310-95a4-ce76da25c4cd