Rollup merge of #130317 - compiler-errors:no-ord, r=jackh726

`ProjectionElem` and `UnOp`/`BinOp` dont need to be `PartialOrd`/`Ord`

These types don't really admit a natural ordering and no code seems to rely on it, so let's remove it.

Author: Zalathar

compiler/rustc_middle/src/mir/syntax.rs

@@ -1094,7 +1094,7 @@ pub struct Place<'tcx> {
     pub projection: &'tcx List<PlaceElem<'tcx>>,
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 #[derive(TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
 pub enum ProjectionElem<V, T> {
     Deref,
@@ -1468,7 +1468,7 @@ pub enum NullOp<'tcx> {
     UbChecks,
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 #[derive(HashStable, TyEncodable, TyDecodable, TypeFoldable, TypeVisitable)]
 pub enum UnOp {
     /// The `!` operator for logical inversion
@@ -1486,7 +1486,7 @@ pub enum UnOp {
     PtrMetadata,
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, PartialOrd, Ord, Eq, Hash)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 #[derive(TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
 pub enum BinOp {
     /// The `+` operator (addition)