// changes to the operand, and apply type converter to operands:
//   V0 = op(operand)
//   ==>
//   V0 = unrealized_cast(operand)
//   V1 = op(V0)
void WrapOperandsInUnrealizedCastAndConvert(Operation *op,
                                            TypeConverter &converter,
                                            IRRewriter &rewriter) {
  for (int i = 0; i < op->getNumOperands(); ++i) {