Use slot API during cloning

Otherwise we can probably run into the same issues here as we could
with destruction.

Author: nikic

Zend/zend_objects.c

@@ -204,14 +204,12 @@ ZEND_API void ZEND_FASTCALL zend_objects_clone_members(zend_object *new_object,
 			i_zval_ptr_dtor(dst);
 			ZVAL_COPY_VALUE(dst, src);
 			zval_add_ref(dst);
-			if (UNEXPECTED(Z_ISREF_P(dst))) {
-				zend_property_info *prop_info;
-				ZEND_REF_FOREACH_TYPE_SOURCES(Z_REF_P(dst), prop_info) {
-					if (prop_info->ce == new_object->ce && dst == OBJ_PROP(new_object, prop_info->offset)) {
-						ZEND_REF_ADD_TYPE_SOURCE(Z_REF_P(dst), prop_info);
-						break; /* stop iteration here, the array might be realloc()'ed */
-					}
-				} ZEND_REF_FOREACH_TYPE_SOURCES_END();
+			if (UNEXPECTED(Z_ISREF_P(dst)) &&
+					(ZEND_DEBUG || ZEND_REF_HAS_TYPE_SOURCES(Z_REF_P(dst)))) {
+				zend_property_info *prop_info = zend_get_property_info_for_slot(new_object, dst);
+				if (prop_info->type) {
+					ZEND_REF_ADD_TYPE_SOURCE(Z_REF_P(dst), prop_info);
+				}
 			}
 			src++;
 			dst++;