gcc-plugins: consolidate on PASS_INFO macro

Now that PASS_INFO() exists, use it in the other existing gcc plugins,
instead of always open coding the same thing.

Based on updates to the grsecurity/PaX gcc plugins.

Signed-off-by: Kees Cook <keescook@chromium.org>
diff --git a/scripts/gcc-plugins/latent_entropy_plugin.c b/scripts/gcc-plugins/latent_entropy_plugin.c
index 8ff203a..6526496 100644
--- a/scripts/gcc-plugins/latent_entropy_plugin.c
+++ b/scripts/gcc-plugins/latent_entropy_plugin.c
@@ -592,12 +592,6 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
 	const struct plugin_argument * const argv = plugin_info->argv;
 	int i;
 
-	struct register_pass_info latent_entropy_pass_info;
-
-	latent_entropy_pass_info.pass		= make_latent_entropy_pass();
-	latent_entropy_pass_info.reference_pass_name		= "optimized";
-	latent_entropy_pass_info.ref_pass_instance_number	= 1;
-	latent_entropy_pass_info.pos_op		= PASS_POS_INSERT_BEFORE;
 	static const struct ggc_root_tab gt_ggc_r_gt_latent_entropy[] = {
 		{
 			.base = &latent_entropy_decl,
@@ -609,6 +603,8 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
 		LAST_GGC_ROOT_TAB
 	};
 
+	PASS_INFO(latent_entropy, "optimized", 1, PASS_POS_INSERT_BEFORE);
+
 	if (!plugin_default_version_check(version, &gcc_version)) {
 		error(G_("incompatible gcc/plugin versions"));
 		return 1;