glsl: make uniform values helper available for use elsewhere

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/compiler/glsl/linker.h

@@ -76,6 +76,9 @@ void
 validate_interstage_uniform_blocks(struct gl_shader_program *prog,
                                    gl_linked_shader **stages);
 
+unsigned
+values_for_type(const glsl_type *type);
+
 extern void
 link_assign_atomic_counter_resources(struct gl_context *ctx,
                                      struct gl_shader_program *prog);