static constexpr char kLower[] = "_lower_using_switch_merge";
static constexpr llvm::StringRef kTpuCompilationStatus =
    "_tpu_compilation_status";

namespace mlir {
namespace TFDevice {
namespace {

bool IsResourceType(Type val_type) {
  if (auto tensor_type = mlir::dyn_cast<mlir::TensorType>(val_type)) {
    if (mlir::isa<TF::ResourceType>(tensor_type.getElementType())) {
      return true;
    }
  }
  return false;
}