Remove #![feature(i128_type)] as i128 is stable
@@ -17,8 +17,6 @@
#![feature(linkage)]
#![feature(lang_items)]
#![allow(unused_features)]
-#![allow(stable_features)] // FIXME(mark-i-m): remove after i128 stabilizes
-#![feature(i128_type)]
#![no_builtins]
#![cfg_attr(feature = "compiler-builtins", feature(staged_api))]
#![cfg_attr(feature = "compiler-builtins",