Fix handling of item names for HIR

- Handle variants, fields, macros in `Node::ident()`
- Handle the crate root in `opt_item_name`
- Factor out `item_name_from_def_id` to reduce duplication
- Look at HIR before the DefId for `opt_item_name`

  This gives accurate spans, which are not available from serialized
  metadata.

- Don't panic on the crate root in `opt_item_name`
- Add comments

compiler/rustc_middle/src/hir/map/mod.rs

@@ -478,7 +478,7 @@ impl<'hir> Map<'hir> {
     }
 
     pub fn get_if_local(&self, id: DefId) -> Option<Node<'hir>> {
-        id.as_local().map(|id| self.get(self.local_def_id_to_hir_id(id)))
+        id.as_local().and_then(|id| self.find(self.local_def_id_to_hir_id(id)))
     }
 
     pub fn get_generics(&self, id: DefId) -> Option<&'hir Generics<'hir>> {