Rollup merge of #58367 - nnethercote:rm-two-dead-funcs, r=alexcrichton

Remove two dead functions.

Author: Centril

src/librustc/infer/mod.rs

@@ -1291,14 +1291,6 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
         value.visit_with(&mut r)
     }
 
-    pub fn resolve_type_and_region_vars_if_possible<T>(&self, value: &T) -> T
-    where
-        T: TypeFoldable<'tcx>,
-    {
-        let mut r = resolve::OpportunisticTypeAndRegionResolver::new(self);
-        value.fold_with(&mut r)
-    }
-
     pub fn fully_resolve<T: TypeFoldable<'tcx>>(&self, value: &T) -> FixupResult<T> {
         /*!
          * Attempts to resolve all type/region variables in

src/librustc/ty/fold.rs

@@ -586,31 +586,6 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
         }).0
     }
 
-    /// Flattens multiple binding levels into one. So `for<'a> for<'b> Foo`
-    /// becomes `for<'a,'b> Foo`.
-    pub fn flatten_late_bound_regions<T>(self, bound2_value: &Binder<Binder<T>>)
-                                         -> Binder<T>
-        where T: TypeFoldable<'tcx>
-    {
-        let bound0_value = bound2_value.skip_binder().skip_binder();
-        let value = self.fold_regions(bound0_value, &mut false, |region, current_depth| {
-            match *region {
-                ty::ReLateBound(debruijn, br) => {
-                    // We assume no regions bound *outside* of the
-                    // binders in `bound2_value` (nmatsakis added in
-                    // the course of this PR; seems like a reasonable
-                    // sanity check though).
-                    assert!(debruijn == current_depth);
-                    self.mk_region(ty::ReLateBound(current_depth, br))
-                }
-                _ => {
-                    region
-                }
-            }
-        });
-        Binder::bind(value)
-    }
-
     /// Returns a set of all late-bound regions that are constrained
     /// by `value`, meaning that if we instantiate those LBR with
     /// variables and equate `value` with something else, those