Introduce ModernIdent type to unify macro 2.0 hygiene handling

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

compiler/rustc_resolve/src/macros.rs

@@ -536,11 +536,11 @@ impl<'ra, 'tcx> ResolverExpand for Resolver<'ra, 'tcx> {
         target_trait.for_each_child(self, |this, ident, ns, _binding| {
             // FIXME: Adjust hygiene for idents from globs, like for glob imports.
             if let Some(overriding_keys) = this.impl_binding_keys.get(&impl_def_id)
-                && overriding_keys.contains(&BindingKey::new(ident, ns))
+                && overriding_keys.contains(&BindingKey::new(ident.0, ns))
             {
                 // The name is overridden, do not produce it from the glob delegation.
             } else {
-                idents.push((ident, None));
+                idents.push((ident.0, None));
             }
         });
         Ok(idents)