namespace mlir {
namespace mhlo {

namespace {

// Returns ops that should use MLIR legalization.
// All other ops not in this list should use XlaOpKernel.
const llvm::DenseSet<mlir::TypeID>& MlirAlwaysOps() {
  // The static variable is a pointer in order to avoid destruction upon thread
  // termination.
  static const llvm::DenseSet<mlir::TypeID>* ops = new llvm::DenseSet<

constexpr char kUncompilableFunctionNodeTwoName[] = "n_d_uncompilable";

// A dummy OpKernel for testing.
class DummyCompilableOp : public XlaOpKernel {
 public:
  explicit DummyCompilableOp(OpKernelConstruction* ctx) : XlaOpKernel(ctx) {}
  void Compile(XlaOpKernelContext* ctx) override {
    ctx->SetOutput(0, ctx->Input(0));
  }
};

// Register the DummyCompilableOp kernel for CPU.

    bool allow_control_trigger = false;

    // Whether it is okay to "cluster" Assert and CheckNumerics by simply
    // removing them (they're not removed during clustering, but their
    // XlaOpKernel is a no-op kernel).  We avoid auto-clustering these ops so
    // that the user is not surprised when XLA is implicitly enabled. If the
    // user explicitly specifies to use XLA, it is fine to resort to a dummy