Rollup merge of #93018 - pierwill:rm-unused-ord, r=davidtwco

Remove some unused `Ord` derives based on `Span`

Remove some `Ord`, `PartialOrd` derivations that rely on underlying ordering of `Span`. These ordering traits appear to be unused right now.

If we're going to attempt to remove ordering traits from `Span` as suggested in https://github.com/rust-lang/rust/issues/90317#issuecomment-1013980591, we might want to slowly remove code that depends on this ordering (as opposed to the all-at-once approach in https://github.com/rust-lang/rust/pull/90749 and https://github.com/rust-lang/rust/pull/90408).

cc `@tmiasko` `@cjgillot`

compiler/rustc_ast/src/ast.rs

@@ -2006,7 +2006,7 @@ bitflags::bitflags! {
     }
 }
 
-#[derive(Clone, PartialEq, PartialOrd, Encodable, Decodable, Debug, Hash, HashStable_Generic)]
+#[derive(Clone, PartialEq, Encodable, Decodable, Debug, Hash, HashStable_Generic)]
 pub enum InlineAsmTemplatePiece {
     String(String),
     Placeholder { operand_idx: usize, modifier: Option<char>, span: Span },
@@ -2211,7 +2211,7 @@ pub enum IsAuto {
     No,
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Encodable, Decodable, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Encodable, Decodable, Debug)]
 #[derive(HashStable_Generic)]
 pub enum Unsafe {
     Yes(Span),

compiler/rustc_middle/src/mir/terminator.rs

@@ -105,7 +105,7 @@ impl<'a> Iterator for SwitchTargetsIter<'a> {
 
 impl<'a> ExactSizeIterator for SwitchTargetsIter<'a> {}
 
-#[derive(Clone, TyEncodable, TyDecodable, Hash, HashStable, PartialEq, PartialOrd)]
+#[derive(Clone, TyEncodable, TyDecodable, Hash, HashStable, PartialEq)]
 pub enum TerminatorKind<'tcx> {
     /// Block should have one successor in the graph; we jump there.
     Goto { target: BasicBlock },