// Returns unique name for the operation or value.
  llvm::StringRef GetUniqueName(OpOrVal op_or_val, int hash_value = 0);

  // Returns unique name as a string_view for the operation or value.
  absl::string_view GetUniqueNameView(OpOrVal op_or_val);

  // Initializes operation or value to map to name. Returns number of
  // operations or value already named 'name' which should be 0 else

  // 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;
  // Update the value in the map with unique name.
  name = StringRefToView(GetUniqueName(GetName(op_or_val)));