Replace LifetimeRes::Anonymous by LifetimeRes::Infer.

compiler/rustc_hir/src/intravisit.rs

@@ -497,7 +497,7 @@ pub fn walk_lifetime<'v, V: Visitor<'v>>(visitor: &mut V, lifetime: &'v Lifetime
         | LifetimeName::Static
         | LifetimeName::Error
         | LifetimeName::ImplicitObjectLifetimeDefault
-        | LifetimeName::Underscore => {}
+        | LifetimeName::Infer => {}
     }
 }