f5804f1768
gl_PointCoord handling needs some special bits set in lima/ppir code generation. Treating gl_PointCoord as a system value makes it easier to distinguish from a regular varying. Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de> Reviewed-by: Qiang Yu <yuq825@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net>