Stabilise repr128

Author: beetrees

tests/ui/auxiliary/proc_macro_attr.rs

@@ -1,5 +1,4 @@
-#![feature(repr128, proc_macro_hygiene, proc_macro_quote, box_patterns)]
-#![allow(incomplete_features)]
+#![feature(proc_macro_hygiene, proc_macro_quote, box_patterns)]
 #![allow(clippy::useless_conversion, clippy::uninlined_format_args)]
 
 extern crate proc_macro;

tests/ui/auxiliary/proc_macro_derive.rs

@@ -1,5 +1,4 @@
-#![feature(repr128, proc_macro_quote, proc_macro_span)]
-#![allow(incomplete_features)]
+#![feature(proc_macro_quote, proc_macro_span)]
 #![allow(clippy::field_reassign_with_default)]
 #![allow(clippy::eq_op)]
 #![allow(clippy::literal_string_with_formatting_args)]

tests/ui/cast.rs

@@ -1,7 +1,5 @@
 //@no-rustfix: only some diagnostics have suggestions
 
-#![feature(repr128)]
-#![allow(incomplete_features)]
 #![warn(
     clippy::cast_precision_loss,
     clippy::cast_possible_truncation,