move swap_nonoverlapping constness to separate feature gate

Author: RalfJung

library/core/src/ptr/mod.rs

@@ -1069,7 +1069,7 @@ pub const unsafe fn swap<T>(x: *mut T, y: *mut T) {
 /// ```
 #[inline]
 #[stable(feature = "swap_nonoverlapping", since = "1.27.0")]
-#[rustc_const_unstable(feature = "const_swap", issue = "83163")]
+#[rustc_const_unstable(feature = "const_swap_nonoverlapping", issue = "133668")]
 #[rustc_diagnostic_item = "ptr_swap_nonoverlapping"]
 pub const unsafe fn swap_nonoverlapping<T>(x: *mut T, y: *mut T, count: usize) {
     #[allow(unused)]
@@ -1129,7 +1129,7 @@ pub const unsafe fn swap_nonoverlapping<T>(x: *mut T, y: *mut T, count: usize) {
 /// LLVM can vectorize this (at least it can for the power-of-two-sized types
 /// `swap_nonoverlapping` tries to use) so no need to manually SIMD it.
 #[inline]
-#[rustc_const_unstable(feature = "const_swap", issue = "83163")]
+#[rustc_const_unstable(feature = "const_swap_nonoverlapping", issue = "133668")]
 const unsafe fn swap_nonoverlapping_simple_untyped<T>(x: *mut T, y: *mut T, count: usize) {
     let x = x.cast::<MaybeUninit<T>>();
     let y = y.cast::<MaybeUninit<T>>();