Introduce sym::dummy and Ident::dummy.

The idea is to identify cases of symbols/identifiers that are not
expected to be used. There isn't a perfectly sharp line between "dummy"
and "not dummy", but I think it's useful nonetheless.

compiler/rustc_resolve/src/diagnostics.rs

@@ -2266,7 +2266,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                     && !first.ident.is_path_segment_keyword() =>
             {
                 // Insert a placeholder that's later replaced by `self`/`super`/etc.
-                path.insert(0, Segment::from_ident(Ident::empty()));
+                path.insert(0, Segment::from_ident(Ident::dummy()));
             }
             _ => return None,
         }