mesa/st: add support for NIR as possible driver IR

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Acked-by: Eric Anholt <eric@anholt.net>

src/mesa/state_tracker/st_program.h

@@ -108,6 +108,9 @@ struct st_fragment_program
    struct glsl_to_tgsi_visitor* glsl_to_tgsi;
    struct ati_fragment_shader *ati_fs;
 
+   /* used when bypassing glsl_to_tgsi: */
+   struct gl_shader_program *shader_program;
+
    struct st_fp_variant *variants;
 };
 
@@ -164,6 +167,9 @@ struct st_vertex_program
    struct pipe_shader_state tgsi;
    struct glsl_to_tgsi_visitor* glsl_to_tgsi;
 
+   /* used when bypassing glsl_to_tgsi: */
+   struct gl_shader_program *shader_program;
+
    /** maps a Mesa VERT_ATTRIB_x to a packed TGSI input index */
    /** maps a TGSI input index back to a Mesa VERT_ATTRIB_x */
    GLuint index_to_input[PIPE_MAX_SHADER_INPUTS];