refs #6089 prepare index scan

git-svn-id: file:///svn/mysql.com/mysql-5.5.30@54774 c7de825b-a66e-492c-adef-691d508d4ae1
refs #6089 prepare range scan

git-svn-id: file:///svn/mysql.com/mysql-5.5.30@54775 c7de825b-a66e-492c-adef-691d508d4ae1