nir: add interpolation qualifiers for color sysvals into shader_info

needed by radeonsi

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6442>

src/compiler/shader_info.h

@@ -307,6 +307,17 @@ typedef struct shader_info {
 
          /** gl_FragDepth layout for ARB_conservative_depth. */
          enum gl_frag_depth_layout depth_layout:3;
+
+         /**
+          * Interpolation qualifiers for drivers that lowers color inputs
+          * to system values.
+          */
+         unsigned color0_interp:3; /* glsl_interp_mode */
+         bool color0_sample:1;
+         bool color0_centroid:1;
+         unsigned color1_interp:3; /* glsl_interp_mode */
+         bool color1_sample:1;
+         bool color1_centroid:1;
       } fs;
 
       struct {