st/mesa: decrease the size of st_fp_variant_key from 48 to 40 bytes

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>

src/mesa/state_tracker/st_program.h

@@ -130,13 +130,13 @@ struct st_fp_variant_key
    /** for OpenGL 1.0 on modern hardware */
    GLuint lower_two_sided_color:1;
 
+   GLuint lower_flatshade:1;
+   enum compare_func lower_alpha_func:3;
+
    /** needed for ATI_fragment_shader */
    char texture_targets[MAX_NUM_FRAGMENT_REGISTERS_ATI];
 
    struct st_external_sampler_key external;
-
-   GLuint lower_flatshade:1;
-   enum compare_func lower_alpha_func:3;
 };