update/bless tests

compiler/rustc_error_codes/src/error_codes/E0622.md

@@ -6,8 +6,9 @@ Erroneous code example:
 #![feature(intrinsics)]
 #![allow(internal_features)]
 
-extern "rust-intrinsic" {
-    pub static atomic_singlethreadfence_seqcst: fn();
+extern "C" {
+    #[rustc_intrinsic]
+    pub static atomic_singlethreadfence_seqcst: unsafe fn();
     // error: intrinsic must be a function
 }
 
@@ -22,9 +23,8 @@ error, just declare a function. Example:
 #![feature(intrinsics)]
 #![allow(internal_features)]
 
-extern "rust-intrinsic" {
-    pub fn atomic_singlethreadfence_seqcst(); // ok!
-}
+#[rustc_intrinsic]
+pub unsafe fn atomic_singlethreadfence_seqcst(); // ok!
 
 fn main() { unsafe { atomic_singlethreadfence_seqcst(); } }
 ```