fix Clippy warning about cloning reference counted pointers

Author: Tage Johansson

compiler/rustc_borrowck/src/nll.rs

@@ -124,7 +124,7 @@ pub(crate) fn compute_regions<'a, 'tcx>(
         infcx,
         constraints,
         universal_region_relations,
-        location_map.clone(),
+        Rc::clone(&location_map),
     );
 
     // If requested: dump NLL facts, and run legacy polonius analysis.

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -487,8 +487,11 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             sccs_info(infcx, &constraint_sccs);
         }
 
-        let mut scc_values =
-            RegionValues::new(location_map.clone(), universal_regions.len(), placeholder_indices);
+        let mut scc_values = RegionValues::new(
+            Rc::clone(&location_map),
+            universal_regions.len(),
+            placeholder_indices,
+        );
 
         for region in liveness_constraints.regions() {
             let scc = constraint_sccs.scc(region);