r600: use macros for updating the various stages.
r600: use macros for updating the various stages.

These macros will make things easier to see when tess
is added to the mix.

Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler