mesa/glsl: stop using GL shader type internally

Instead use the internal gl_shader_stage enum everywhere. This
makes things more consistent and gets rid of unnecessary
conversions.

Ideally it would be nice to remove the Type field from gl_shader
altogether but currently it is used to differentiate between
gl_shader and gl_shader_program in the ShaderObjects hash table.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/compiler/glsl/link_varyings.cpp

@@ -2129,7 +2129,7 @@ assign_varying_locations(struct gl_context *ctx,
           * within a patch and can be used as shared memory.
           */
          if (input_var || (prog->SeparateShader && consumer == NULL) ||
-             producer->Type == GL_TESS_CONTROL_SHADER) {
+             producer->Stage == MESA_SHADER_TESS_CTRL) {
             matches.record(output_var, input_var);
          }