rename ReLateBound to ReBound

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

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -150,7 +150,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for MaxEscapingBoundVarVisitor {
     #[inline]
     fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
         match *r {
-            ty::ReLateBound(debruijn, _) if debruijn > self.outer_index => {
+            ty::ReBound(debruijn, _) if debruijn > self.outer_index => {
                 self.escaping =
                     self.escaping.max(debruijn.as_usize() - self.outer_index.as_usize());
             }