Lint on invalid UnsafeCell::raw_get with invalid_reference_casting lint

Author: Urgau

core/src/cell.rs

@@ -2131,6 +2131,7 @@ impl<T: ?Sized> UnsafeCell<T> {
     #[inline(always)]
     #[stable(feature = "unsafe_cell_raw_get", since = "1.56.0")]
     #[rustc_const_stable(feature = "unsafe_cell_raw_get", since = "1.56.0")]
+    #[rustc_diagnostic_item = "unsafe_cell_raw_get"]
     pub const fn raw_get(this: *const Self) -> *mut T {
         // We can just cast the pointer from `UnsafeCell<T>` to `T` because of
         // #[repr(transparent)]. This exploits std's special status, there is