make NonNull::drop_in_place call drop_glue directly

library/core/src/ptr/mod.rs

@@ -822,7 +822,7 @@
 
 /// Helper function for `drop_in_place`. The compiler replaces this by the actual drop glue.
 #[lang = "drop_glue"]
-const unsafe fn drop_glue<T: PointeeSized>(_: &mut T)
+pub(crate) const unsafe fn drop_glue<T: PointeeSized>(_: &mut T)
 where
     T: [const] Destruct,
 {

library/core/src/ptr/non_null.rs

@@ -1116,12 +1116,12 @@ pub unsafe fn read_volatile(self) -> T
     #[inline(always)]
     #[stable(feature = "non_null_convenience", since = "1.80.0")]
     #[rustc_const_unstable(feature = "const_drop_in_place", issue = "109342")]
-    pub const unsafe fn drop_in_place(self)
+    pub const unsafe fn drop_in_place(mut self)
     where
         T: [const] Destruct,
     {
         // SAFETY: the caller must uphold the safety contract for `drop_in_place`.
-        unsafe { ptr::drop_in_place(self.as_ptr()) }
+        unsafe { ptr::drop_glue(self.as_mut()) }
     }
 
     /// Overwrites a memory location with the given value without reading or