message: Fix metadata symbol scope
  It should be exported from the generated dylib
diff: @@ -58,7 +58,7 @@ fn add_rustc_section(&mut self, symbol_name: String, data: Vec<u8>, _is_like_osx
  value: offset,
  size: data.len() as u64,
  kind: object::SymbolKind::Data,
  - scope: object::SymbolScope::Compilation,
  + scope: object::SymbolScope::Dynamic,
  weak: false,
  section: Some(section_id),
  });
  