nvc0: always emit a full shader colormask
Indications are that if the colormask indicates a single bit set on fermi, that value will always be read from $r0 instead of a potentially higher register (if e.g. green is set). Not to upset the counting logic, always set the header up with a full color mask for each RT. Such a situation can basically only ever happen with generated blit shaders. Fixes the following piglit on Fermi (Kepler is unaffected): fbo-stencil blit GL_DEPTH32F_STENCIL8 Signed-off-by:Ilia Mirkin <imirkin@alum.mit.edu> Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org> (cherry picked from commit 39df725f)
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