Use local path for already-imported function

This module has `use super::*;` at the top.

Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de>

library/core/src/ptr/const_ptr.rs

@@ -56,7 +56,7 @@ pub const fn cast<U>(self) -> *const U {
     #[rustc_const_unstable(feature = "ptr_metadata", issue = "81513")]
     #[inline]
     pub const fn to_raw_parts(self) -> (*const (), <T as super::Pointee>::Metadata) {
-        (self.cast(), super::metadata(self))
+        (self.cast(), metadata(self))
     }
 
     /// Returns `None` if the pointer is null, or else returns a shared reference to