Check for __unserialize pointer first

As the check is cheaper and this is what the deprecation for __sleep() does

Author: Girgias

Zend/zend_compile.c

@@ -9355,7 +9355,7 @@ static void zend_compile_class_decl(znode *result, zend_ast *ast, bool toplevel)
 		zend_error(E_DEPRECATED, "The __sleep() serialization magic method has been deprecated."
 			" Implement __serialize() instead (or in addition, if support for old PHP versions is necessary)");
 	}
-	if (UNEXPECTED(zend_hash_exists(&ce->function_table, ZSTR_KNOWN(ZEND_STR_WAKEUP)) && ce->__unserialize == NULL)) {
+	if (ce->__unserialize == NULL && zend_hash_exists(&ce->function_table, ZSTR_KNOWN(ZEND_STR_WAKEUP))) {
 		zend_error(E_DEPRECATED, "The __wakeup() serialization magic method has been deprecated."
 			" Implement __unserialize() instead (or in addition, if support for old PHP versions is necessary)");
 	}