void runOnOperation() override;
};

// Returns name of TPU cluster, if op belongs to a TPU cluster. Otherwise,
// returns `std::nullopt`.
std::optional<llvm::StringRef> GetTpuClusterName(Operation* op) {
  if (auto tpu_status = op->getAttrOfType<StringAttr>(kTpuStatusAttr)) {
    // Borrow cluster name from TPU status (for `TPUCompilationResult` op).
    return tpu_status.getValue();
  }