Auto merge of #105160 - nnethercote:rm-Lit-token_lit, r=petrochenkov

Remove `token::Lit` from `ast::MetaItemLit`.

Currently `ast::MetaItemLit` represents the literal kind twice. This PR removes that redundancy. Best reviewed one commit at a time.

r? `@petrochenkov`

compiler/rustc_ast_lowering/src/expr.rs

@@ -97,7 +97,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 }
                 ExprKind::IncludedBytes(bytes) => hir::ExprKind::Lit(respan(
                     self.lower_span(e.span),
-                    LitKind::ByteStr(bytes.clone()),
+                    LitKind::ByteStr(bytes.clone(), StrStyle::Cooked),
                 )),
                 ExprKind::Cast(expr, ty) => {
                     let expr = self.lower_expr(expr);

compiler/rustc_ast_lowering/src/lib.rs

@@ -958,7 +958,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                     lit
                 } else {
                     MetaItemLit {
-                        token_lit: token::Lit::new(token::LitKind::Err, kw::Empty, None),
+                        symbol: kw::Empty,
+                        suffix: None,
                         kind: LitKind::Err,
                         span: DUMMY_SP,
                     }