message: Remove control flow ops now that they are registered elsewhere
diff: @@ -165,16 +165,10 @@ REGISTER_XLA_OP(Name("ArgMax")
  .CompileTimeConstInput("dimension"),
  XlaArgMaxOp);
  -REGISTER_XLA_OP(Name("Enter").Device(DEVICE_IPU_XLA_JIT), NoOp);
  REGISTER_XLA_OP(Name("RefEnter").Device(DEVICE_IPU_XLA_JIT), NoOp);
  -REGISTER_XLA_OP(Name("Exit").Device(DEVICE_IPU_XLA_JIT), NoOp);
  REGISTER_XLA_OP(Name("RefExit").Device(DEVICE_IPU_XLA_JIT), NoOp);
  -REGISTER_XLA_OP(Name("LoopCond").Device(DEVICE_IPU_XLA_JIT), NoOp);
  -REGISTER_XLA_OP(Name("Merge").Device(DEVICE_IPU_XLA_JIT), NoOp);
  REGISTER_XLA_OP(Name("RefMerge").Device(DEVICE_IPU_XLA_JIT), NoOp);
  -REGISTER_XLA_OP(Name("NextIteration").Device(DEVICE_IPU_XLA_JIT), NoOp);
  REGISTER_XLA_OP(Name("RefNextIteration").Device(DEVICE_IPU_XLA_JIT), NoOp);
  -REGISTER_XLA_OP(Name("Switch").Device(DEVICE_IPU_XLA_JIT), NoOp);
  REGISTER_XLA_OP(Name("RefSwitch").Device(DEVICE_IPU_XLA_JIT), NoOp);
  } // namespace tensorflow
  