Encode const params attributes in rmeta

Author: Urgau

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -942,6 +942,7 @@ fn should_encode_attrs(def_kind: DefKind) -> bool {
         | DefKind::AssocConst { .. }
         | DefKind::Macro(_)
         | DefKind::Field
+        | DefKind::ConstParam
         | DefKind::Impl { .. } => true,
         // Tools may want to be able to detect their tool lints on
         // closures from upstream crates, too. This is used by
@@ -950,7 +951,6 @@ fn should_encode_attrs(def_kind: DefKind) -> bool {
         DefKind::Closure => true,
         DefKind::SyntheticCoroutineBody => false,
         DefKind::TyParam
-        | DefKind::ConstParam
         | DefKind::Ctor(..)
         | DefKind::ExternCrate
         | DefKind::Use