rename ReLateBound to ReBound

other changes:
- `Region::new_late_bound` -> `Region::new_bound`
- `Region::is_late_bound` -> `Region::is_bound`

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -2345,7 +2345,7 @@ fn param_env_with_gat_bounds<'tcx>(
                     let kind = ty::BoundRegionKind::BrNamed(param.def_id, param.name);
                     let bound_var = ty::BoundVariableKind::Region(kind);
                     bound_vars.push(bound_var);
-                    ty::Region::new_late_bound(
+                    ty::Region::new_bound(
                         tcx,
                         ty::INNERMOST,
                         ty::BoundRegion {