Require const stability attributes on intrinsics to be able to use them in constant contexts

src/test/ui/consts/const-eval/simd/insert_extract.rs

@@ -2,6 +2,8 @@
 #![feature(const_fn)]
 #![feature(repr_simd)]
 #![feature(platform_intrinsics)]
+#![feature(staged_api)]
+#![stable(feature = "foo", since = "1.33.7")]
 #![allow(non_camel_case_types)]
 
 #[repr(simd)] struct i8x1(i8);
@@ -9,7 +11,9 @@
 #[repr(simd)] struct f32x3(f32, f32, f32);
 
 extern "platform-intrinsic" {
+    #[rustc_const_stable(feature = "foo", since = "1.3.37")]
     fn simd_insert<T, U>(x: T, idx: u32, val: U) -> T;
+    #[rustc_const_stable(feature = "foo", since = "1.3.37")]
     fn simd_extract<T, U>(x: T, idx: u32) -> U;
 }
 

src/test/ui/consts/const-fn-type-name.rs

@@ -2,6 +2,7 @@
 
 #![feature(core_intrinsics)]
 #![feature(const_fn)]
+#![feature(const_type_name)]
 #![allow(dead_code)]
 
 const fn type_name_wrapper<T>(_: &T) -> &'static str {