stabilize const_cttz

Author: andjo403

core/src/intrinsics.rs

@@ -1543,7 +1543,7 @@ extern "rust-intrinsic" {
     /// let num_trailing = unsafe { cttz_nonzero(x) };
     /// assert_eq!(num_trailing, 3);
     /// ```
-    #[rustc_const_unstable(feature = "const_cttz", issue = "none")]
+    #[rustc_const_stable(feature = "const_cttz", since = "1.53.0")]
     pub fn cttz_nonzero<T: Copy>(x: T) -> T;
 
     /// Reverses the bytes in an integer type `T`.

core/src/lib.rs

@@ -79,7 +79,6 @@
 #![feature(const_int_unchecked_arith)]
 #![feature(const_mut_refs)]
 #![feature(const_refs_to_cell)]
-#![feature(const_cttz)]
 #![feature(const_panic)]
 #![feature(const_pin)]
 #![feature(const_fn)]