I'm not seeing as much as I would expect here, mostly because pahole
seems to be having trouble parsing quite a few of our structures, and
consequently producing useless data than I then ignore.

XDash 24bytes -> 20bytes
vcl::font::FeatureDefinition 64bytes -> 56bytes
SvXMLTokenMapEntry 16bytes -> 12bytes
SvXMLItemMapEntry 16bytes -> 12bytes
SwContentAtPos 40bytes -> 32bytes

Change-Id: I74c8b93f74b8352f48ef552d7d4239aa7f4237d4
Reviewed-on: https://gerrit.libreoffice.org/69304
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>