Rollup merge of #66941 - CAD97:nord, r=Dylan-DPC

Remove `ord` lang item

At this point it seems to be unused, and just `partial_ord` is used instead. This removes the unused lang item.

src/libcore/cmp.rs

@@ -534,7 +534,6 @@ fn cmp(&self, other: &Reverse<T>) -> Ordering {
 ///     }
 /// }
 /// ```
-#[lang = "ord"]
 #[doc(alias = "<")]
 #[doc(alias = ">")]
 #[doc(alias = "<=")]

src/librustc/middle/lang_items.rs

@@ -358,7 +358,6 @@ pub fn collect<'tcx>(tcx: TyCtxt<'tcx>) -> LanguageItems {
     // Don't be fooled by the naming here: this lang item denotes `PartialEq`, not `Eq`.
     EqTraitLangItem,             "eq",                 eq_trait,                Target::Trait;
     PartialOrdTraitLangItem,     "partial_ord",        partial_ord_trait,       Target::Trait;
-    OrdTraitLangItem,            "ord",                ord_trait,               Target::Trait;
 
     // A number of panic-related lang items. The `panic` item corresponds to
     // divide-by-zero and various panic cases with `match`. The