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_attr_parsing/src/context.rs

@@ -9,7 +9,6 @@ use rustc_errors::{DiagCtxtHandle, Diagnostic};
 use rustc_feature::Features;
 use rustc_hir::{AttrArgs, AttrItem, AttrPath, Attribute, HashIgnoredAttrId};
 use rustc_session::Session;
-use rustc_span::symbol::kw;
 use rustc_span::{DUMMY_SP, ErrorGuaranteed, Span, Symbol, sym};
 
 use crate::attributes::allow_unstable::{AllowConstFnUnstableParser, AllowInternalUnstableParser};
@@ -338,7 +337,7 @@ impl<'sess> AttributeParser<'sess> {
                         "expr in place where literal is expected (builtin attr parsing)",
                     );
                     ast::MetaItemLit {
-                        symbol: kw::Empty,
+                        symbol: sym::dummy,
                         suffix: None,
                         kind: ast::LitKind::Err(guar),
                         span: DUMMY_SP,