Make ReflectionType an abstract class

This is never instantiated directly, only child classes are used.

Author: nikic

ext/reflection/php_reflection.c

@@ -6790,6 +6790,7 @@ PHP_MINIT_FUNCTION(reflection) /* {{{ */
 	INIT_CLASS_ENTRY(_reflection_entry, "ReflectionType", reflection_type_functions);
 	reflection_init_class_handlers(&_reflection_entry);
 	reflection_type_ptr = zend_register_internal_class(&_reflection_entry);
+	reflection_type_ptr->ce_flags |= ZEND_ACC_EXPLICIT_ABSTRACT_CLASS;
 
 	INIT_CLASS_ENTRY(_reflection_entry, "ReflectionNamedType", reflection_named_type_functions);
 	reflection_init_class_handlers(&_reflection_entry);