enable using the evaluation cache on predicates with LBRs

There is no reason not to do it.

src/librustc/traits/fulfill.rs

@@ -292,7 +292,7 @@ fn process_obligation(&mut self,
             ty::Predicate::Trait(ref data) => {
                 let trait_obligation = obligation.with(data.clone());
 
-                if data.is_global() && !data.has_late_bound_regions() {
+                if data.is_global() {
                     // no type variables present, can use evaluation for better caching.
                     // FIXME: consider caching errors too.
                     if self.selcx.infcx().predicate_must_hold(&obligation) {