intel/genxml: Emit genxml enums as C enums
intel/genxml: Emit genxml enums as C enums

The previous commits got rid of any clashes between #defines and enum
values and we can now emit the genxml enums as debugger friendly C
enums.

Signed-off-by: Kristian H. Kristensen <5277675e75ce288440b982e61b7eecdaaf22a4dd@gmail.com>
Reviewed-by: Jason Ekstrand <68c46a606457643eab92053c1c05574abb26f861@jlekstrand.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler