auto& name = op_or_val_to_name_[op_or_val];
  if (!name.empty()) return StringViewToRef(name);
  // Update the value in the map with unique name.
  llvm::StringRef ref = GetUniqueName(GetName(op_or_val), hash_value);
  name = StringRefToView(ref);
  return ref;
}

absl::string_view OpOrArgNameMapper::GetUniqueNameView(OpOrVal op_or_val) {
  auto& name = op_or_val_to_name_[op_or_val];
  if (!name.empty()) return name;