nir: move shader_enums.[ch] to compiler

This way one can reuse it in glsl, nir or other infrastructure without
pulling nir as dependency.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Matt Turner <mattst88@gmail.com>
Acked-by: Jose Fonseca <jfonseca@vmware.com>
24 files changed