no need to store such small movable and ref-counted objects separately

Change-Id: Idf4262a8edbfe07fcb4b96d1025924224b72b5b6
Reviewed-on: https://gerrit.libreoffice.org/61113
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>