Sort DO_DEFAULT_ACL dump objects independent of OIDs.

Commit 0decd5e89d missed DO_DEFAULT_ACL,
leading to assertion failures, potential dump order instability, and
spurious schema diffs.  Back-patch to v13, like that commit.

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Author: Kirill Reshke <reshkekirill@gmail.com>
Discussion: https://postgr.es/m/d32aaa8d-df7c-4f94-bcb3-4c85f02bea21@gmail.com
Backpatch-through: 13

src/bin/pg_dump/pg_dump_sort.c

@@ -418,6 +418,19 @@ DOTypeNameCompare(const void *p1, const void *p2)
 				return cmpval;
 		}
 	}
+	else if (obj1->objType == DO_DEFAULT_ACL)
+	{
+		DefaultACLInfo *daclobj1 = *(DefaultACLInfo *const *) p1;
+		DefaultACLInfo *daclobj2 = *(DefaultACLInfo *const *) p2;
+
+		/*
+		 * Sort by defaclrole, per pg_default_acl_role_nsp_obj_index.  The
+		 * (namespace, name) match (defaclnamespace, defaclobjtype).
+		 */
+		cmpval = strcmp(daclobj1->defaclrole, daclobj2->defaclrole);
+		if (cmpval != 0)
+			return cmpval;
+	}
 	else if (obj1->objType == DO_PUBLICATION_REL)
 	{
 		PublicationRelInfo *probj1 = *(PublicationRelInfo *const *) p1;

src/test/regress/expected/privileges.out

@@ -3153,6 +3153,11 @@ DROP USER regress_priv_user6;
 DROP USER regress_priv_user7;
 DROP USER regress_priv_user8; -- does not exist
 ERROR:  role "regress_priv_user8" does not exist
+-- leave some default ACLs for pg_upgrade's dump-restore test input.
+ALTER DEFAULT PRIVILEGES FOR ROLE pg_signal_backend
+	REVOKE INSERT ON TABLES FROM pg_signal_backend;
+ALTER DEFAULT PRIVILEGES FOR ROLE pg_read_all_settings
+	REVOKE INSERT ON TABLES FROM pg_read_all_settings;
 -- permissions with LOCK TABLE
 CREATE USER regress_locktable_user;
 CREATE TABLE lock_table (a int);

src/test/regress/sql/privileges.sql

@@ -1863,6 +1863,13 @@ DROP USER regress_priv_user7;
 DROP USER regress_priv_user8; -- does not exist
 
 
+-- leave some default ACLs for pg_upgrade's dump-restore test input.
+ALTER DEFAULT PRIVILEGES FOR ROLE pg_signal_backend
+	REVOKE INSERT ON TABLES FROM pg_signal_backend;
+ALTER DEFAULT PRIVILEGES FOR ROLE pg_read_all_settings
+	REVOKE INSERT ON TABLES FROM pg_read_all_settings;
+
+
 -- permissions with LOCK TABLE
 CREATE USER regress_locktable_user;
 CREATE TABLE lock_table (a int);