Remove synstructure::Structure::underscore_const calls.

The `synstructure` docs say "This method is a no-op, underscore consts
are used by default now." The behaviour change occurred going from
`synstructure` version 0.13.0 to 0.13.1.

compiler/rustc_macros/src/lift.rs

@@ -4,7 +4,6 @@ use syn::parse_quote;
 pub(super) fn lift_derive(mut s: synstructure::Structure<'_>) -> proc_macro2::TokenStream {
     s.add_bounds(synstructure::AddBounds::Generics);
     s.bind_with(|_| synstructure::BindStyle::Move);
-    s.underscore_const(true);
 
     let tcx: syn::Lifetime = parse_quote!('tcx);
     let newtcx: syn::GenericParam = parse_quote!('__lifted);