[GPOS] Implement Device support in AnchorFormat3
[GPOS] Implement Device support in AnchorFormat3

zsx/pango,OpenInkpot-archive/iplinux-pango1.0,Distrotech/pango,OpenInkpot-archive/iplinux-pango1.0,Distrotech/pango,kari-lentz/alpha-pango,danny-ku/pango,danny-ku/pango,zsx/pango,zsx/pango,kari-lentz/alpha-pango,kari-lentz/alpha-pango,zsx/pango,danny-ku/pango,OpenInkpot-archive/iplinux-pango1.0,kari-lentz/alpha-pango,Distrotech/pango