Merge branch 'PHP-8.1'

* PHP-8.1:
  Avoid class name validation if it's already have IS_STR_CLASS_NAME_MAP_PTR flag.

Author: dstogov

Zend/zend_execute_API.c

@@ -1102,7 +1102,7 @@ ZEND_API zend_class_entry *zend_lookup_class_ex(zend_string *name, zend_string *
 	}
 
 	/* Verify class name before passing it to the autoloader. */
-	if (!key && !zend_is_valid_class_name(name)) {
+	if (!key && !ZSTR_HAS_CE_CACHE(name) && !zend_is_valid_class_name(name)) {
 		zend_string_release_ex(lc_name, 0);
 		return NULL;
 	}