Rollup merge of #73974 - CAD97:rc-no-weak, r=dtolnay

Move A|Rc::as_ptr from feature(weak_into_raw) to feature(rc_as_ptr)

These were stabilized alongside the Weak versions, but having `feature = "weak_.."` on a fn definition for the non-weak pointers is potentially very misleading, especially in a review context where the impl header may not be immediately visible.

r? @RalfJung
@bors rollup=always

src/liballoc/rc.rs

@@ -1701,7 +1701,7 @@ impl<T> Weak<T> {
     /// ```
     ///
     /// [`null`]: ../../std/ptr/fn.null.html
-    #[stable(feature = "weak_into_raw", since = "1.45.0")]
+    #[stable(feature = "rc_as_ptr", since = "1.45.0")]
     pub fn as_ptr(&self) -> *const T {
         let ptr: *mut RcBox<T> = NonNull::as_ptr(self.ptr);
 

src/liballoc/sync.rs

@@ -587,7 +587,7 @@ impl<T: ?Sized> Arc<T> {
     /// assert_eq!(x_ptr, Arc::as_ptr(&y));
     /// assert_eq!(unsafe { &*x_ptr }, "hello");
     /// ```
-    #[stable(feature = "weak_into_raw", since = "1.45.0")]
+    #[stable(feature = "rc_as_ptr", since = "1.45.0")]
     pub fn as_ptr(this: &Self) -> *const T {
         let ptr: *mut ArcInner<T> = NonNull::as_ptr(this.ptr);