Inline and remove {enter,exit}_attrs functions.

They each have a single call site.

compiler/rustc_lint/src/early.rs

@@ -63,20 +63,12 @@ fn with_lint_attrs<F>(&mut self, id: ast::NodeId, attrs: &'a [ast::Attribute], f
         let push = self.context.builder.push(attrs, is_crate_node, None);
 
         self.check_id(id);
-        self.enter_attrs(attrs);
-        f(self);
-        self.exit_attrs(attrs);
-        self.context.builder.pop(push);
-    }
-
-    fn enter_attrs(&mut self, attrs: &'a [ast::Attribute]) {
         debug!("early context: enter_attrs({:?})", attrs);
         run_early_pass!(self, enter_lint_attrs, attrs);
-    }
-
-    fn exit_attrs(&mut self, attrs: &'a [ast::Attribute]) {
+        f(self);
         debug!("early context: exit_attrs({:?})", attrs);
         run_early_pass!(self, exit_lint_attrs, attrs);
+        self.context.builder.pop(push);
     }
 }
 

compiler/rustc_lint/src/late.rs

@@ -59,9 +59,11 @@ fn with_lint_attrs<F>(&mut self, id: hir::HirId, f: F)
         let attrs = self.context.tcx.hir().attrs(id);
         let prev = self.context.last_node_with_lint_attrs;
         self.context.last_node_with_lint_attrs = id;
-        self.enter_attrs(attrs);
+        debug!("late context: enter_attrs({:?})", attrs);
+        lint_callback!(self, enter_lint_attrs, attrs);
         f(self);
-        self.exit_attrs(attrs);
+        debug!("late context: exit_attrs({:?})", attrs);
+        lint_callback!(self, exit_lint_attrs, attrs);
         self.context.last_node_with_lint_attrs = prev;
     }
 
@@ -81,16 +83,6 @@ fn process_mod(&mut self, m: &'tcx hir::Mod<'tcx>, s: Span, n: hir::HirId) {
         hir_visit::walk_mod(self, m, n);
         lint_callback!(self, check_mod_post, m, s, n);
     }
-
-    fn enter_attrs(&mut self, attrs: &'tcx [ast::Attribute]) {
-        debug!("late context: enter_attrs({:?})", attrs);
-        lint_callback!(self, enter_lint_attrs, attrs);
-    }
-
-    fn exit_attrs(&mut self, attrs: &'tcx [ast::Attribute]) {
-        debug!("late context: exit_attrs({:?})", attrs);
-        lint_callback!(self, exit_lint_attrs, attrs);
-    }
 }
 
 impl<'tcx, T: LateLintPass<'tcx>> hir_visit::Visitor<'tcx> for LateContextAndPass<'tcx, T> {