Skip frameless functions with zend_execute_internal

zend_execute_internal is used to intercept function calls. We must use the
DO_FCALL opcode in this instance.

Author: iluuu1994

Zend/zend_compile.c

@@ -4543,7 +4543,7 @@ static uint32_t find_frameless_function_offset(uint32_t arity, void *handler)
 
 static const zend_frameless_function_info *find_frameless_function_info(zend_ast_list *args, zend_function *fbc, uint32_t type)
 {
-	if (ZEND_OBSERVER_ENABLED) {
+	if (ZEND_OBSERVER_ENABLED || zend_execute_internal) {
 		return NULL;
 	}