radv/aco: return a correct name and description for the backend IR

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_shader.c

@@ -1160,6 +1160,7 @@ shader_variant_compile(struct radv_device *device,
 		free(binary);
 		return NULL;
 	}
+	variant->aco_used = use_aco;
 
 	if (options->dump_shader) {
 		fprintf(stderr, "disasm:\n%s\n", variant->disasm_string);