In pg_upgrade, fix bug where no users were dumped in pg_dumpall

binary-upgrade mode;  instead only skip dumping the current user.

This bug was introduced in during the removal of split_old_dump().  Bug
discovered during local testing.

src/bin/pg_dump/pg_dumpall.c

@@ -642,7 +642,8 @@ dumpRoles(PGconn *conn)
 				i_rolpassword,
 				i_rolvaliduntil,
 				i_rolreplication,
-				i_rolcomment;
+				i_rolcomment,
+				i_is_current_user;
 	int			i;
 
 	/* note: rolconfig is dumped later */
@@ -652,7 +653,8 @@ dumpRoles(PGconn *conn)
 						  "rolcreaterole, rolcreatedb, "
 						  "rolcanlogin, rolconnlimit, rolpassword, "
 						  "rolvaliduntil, rolreplication, "
-			  "pg_catalog.shobj_description(oid, 'pg_authid') as rolcomment "
+			  "pg_catalog.shobj_description(oid, 'pg_authid') as rolcomment, "
+			  			  "rolname = current_user AS is_current_user "
 						  "FROM pg_authid "
 						  "ORDER BY 2");
 	else if (server_version >= 80200)
@@ -661,7 +663,8 @@ dumpRoles(PGconn *conn)
 						  "rolcreaterole, rolcreatedb, "
 						  "rolcanlogin, rolconnlimit, rolpassword, "
 						  "rolvaliduntil, false as rolreplication, "
-			  "pg_catalog.shobj_description(oid, 'pg_authid') as rolcomment "
+			  "pg_catalog.shobj_description(oid, 'pg_authid') as rolcomment, "
+			  			  "rolname = current_user AS is_current_user "
 						  "FROM pg_authid "
 						  "ORDER BY 2");
 	else if (server_version >= 80100)
@@ -670,7 +673,8 @@ dumpRoles(PGconn *conn)
 						  "rolcreaterole, rolcreatedb, "
 						  "rolcanlogin, rolconnlimit, rolpassword, "
 						  "rolvaliduntil, false as rolreplication, "
-						  "null as rolcomment "
+						  "null as rolcomment, "
+			  			  "rolname = current_user AS is_current_user "
 						  "FROM pg_authid "
 						  "ORDER BY 2");
 	else
@@ -685,7 +689,8 @@ dumpRoles(PGconn *conn)
 						  "passwd as rolpassword, "
 						  "valuntil as rolvaliduntil, "
 						  "false as rolreplication, "
-						  "null as rolcomment "
+						  "null as rolcomment, "
+			  			  "rolname = current_user AS is_current_user "
 						  "FROM pg_shadow "
 						  "UNION ALL "
 						  "SELECT 0, groname as rolname, "
@@ -698,7 +703,7 @@ dumpRoles(PGconn *conn)
 						  "null::text as rolpassword, "
 						  "null::abstime as rolvaliduntil, "
 						  "false as rolreplication, "
-						  "null as rolcomment "
+						  "null as rolcomment, false "
 						  "FROM pg_group "
 						  "WHERE NOT EXISTS (SELECT 1 FROM pg_shadow "
 						  " WHERE usename = groname) "
@@ -718,6 +723,7 @@ dumpRoles(PGconn *conn)
 	i_rolvaliduntil = PQfnumber(res, "rolvaliduntil");
 	i_rolreplication = PQfnumber(res, "rolreplication");
 	i_rolcomment = PQfnumber(res, "rolcomment");
+	i_is_current_user = PQfnumber(res, "is_current_user");
 
 	if (PQntuples(res) > 0)
 		fprintf(OPF, "--\n-- Roles\n--\n\n");
@@ -746,9 +752,10 @@ dumpRoles(PGconn *conn)
 		 * won't hurt for the CREATE to fail).  This is particularly important
 		 * for the role we are connected as, since even with --clean we will
 		 * have failed to drop it.  binary_upgrade cannot generate any errors,
-		 * so we assume the role is already created.
+		 * so we assume the current role is already created.
 		 */
-		if (!binary_upgrade)
+		if (!binary_upgrade ||
+			strcmp(PQgetvalue(res, i, i_is_current_user), "f") == 0)
 			appendPQExpBuffer(buf, "CREATE ROLE %s;\n", fmtId(rolename));
 		appendPQExpBuffer(buf, "ALTER ROLE %s WITH", fmtId(rolename));