struct TFRTypeStorage final
    : public TypeStorage,
      public llvm::TrailingObjects<TFRTypeStorage, StringAttr> {
  using KeyTy = ArrayRef<StringAttr>;

  explicit TFRTypeStorage(unsigned num_attrs) : num_attrs(num_attrs) {}

  static TFRTypeStorage* construct(TypeStorageAllocator& allocator, KeyTy key) {
    // Allocate a new storage instance.
    auto byteSize = TFRTypeStorage::totalSizeToAlloc<StringAttr>(key.size());