message: [SwiftASTContext] The DWARFImporter is not a Clang module loader.
  <rdar://problem/49856499>
diff: @@ -3089,7 +3089,7 @@ swift::ClangImporter *SwiftASTContext::GetClangImporter() {
  if (dwarf_importer_ap) {
  m_dwarf_importer = dwarf_importer_ap.get();
  m_ast_context_ap->addModuleLoader(std::move(dwarf_importer_ap),
  - is_clang);
  + !is_clang);
  }
  }
  }
  