objectcacher: match states before merging in map_write
objectcacher: match states before merging in map_write

The caller is going to set us to dirty, so we don't care what state we
have, so long as the left and right bits we're merging match all is ok.

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph