compiler: add printable values for cull distance varyings.

We need these for spir-v/nir shaders.

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/compiler/shader_enums.c

@@ -151,6 +151,8 @@ gl_varying_slot_name(gl_varying_slot slot)
       ENUM(VARYING_SLOT_CLIP_VERTEX),
       ENUM(VARYING_SLOT_CLIP_DIST0),
       ENUM(VARYING_SLOT_CLIP_DIST1),
+      ENUM(VARYING_SLOT_CULL_DIST0),
+      ENUM(VARYING_SLOT_CULL_DIST1),
       ENUM(VARYING_SLOT_PRIMITIVE_ID),
       ENUM(VARYING_SLOT_LAYER),
       ENUM(VARYING_SLOT_VIEWPORT),