Fix incompatible stability lint

Author: jhpratt

library/core/src/intrinsics.rs

@@ -53,6 +53,8 @@
     issue = "none"
 )]
 #![allow(missing_docs)]
+// intrinsics are never stable but may need to be const-stable for other items
+#![cfg_attr(not(bootstrap), allow(rustc::incompatible_stability))]
 
 use crate::marker::DiscriminantKind;
 use crate::mem;

library/core/src/num/saturating.rs

@@ -628,7 +628,7 @@ macro_rules! saturating_int_impl {
             /// ```
             #[inline]
             #[unstable(feature = "saturating_int_impl", issue = "87920")]
-            #[rustc_const_stable(feature = "const_reverse_bits", since = "1.37.0")]
+            #[rustc_const_unstable(feature = "saturating_int_impl", issue = "87920")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
             pub const fn reverse_bits(self) -> Self {

library/core/src/num/uint_macros.rs

@@ -2208,7 +2208,7 @@ macro_rules! uint_impl {
         /// ```
         #[unstable(feature = "wrapping_next_power_of_two", issue = "32463",
                    reason = "needs decision on wrapping behaviour")]
-        #[rustc_const_stable(feature = "const_int_pow", since = "1.50.0")]
+        #[rustc_const_unstable(feature = "wrapping_next_power_of_two", issue = "32463")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         pub const fn wrapping_next_power_of_two(self) -> Self {