remove unnecessary PartialOrd and Ord

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -135,7 +135,6 @@ pub struct RegionInferenceContext<'tcx> {
 /// adds a new lower bound to the SCC it is analyzing: so you wind up
 /// with `'R: 'O` where `'R` is the pick-region and `'O` is the
 /// minimal viable option.
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
 pub(crate) struct AppliedMemberConstraint {
     /// The SCC that was affected. (The "member region".)
     ///