//   ==>
//   result = op(V0)
//   V1     = unrealized_cast(result)
//   V2     = op2(V1)
void ConvertAndWrapUsesInUnrealizedCast(Value result, TypeConverter &converter,
                                        IRRewriter &rewriter) {
  auto type = result.getType();
  result.setType(converter.convertType(result.getType()));
  auto new_value = converter.materializeArgumentConversion(
      rewriter, result.getLoc(), type, {result});

}

std::vector<std::pair<int, int>> Translator::ExtractControlEdges(
    mlir::Block* block) {
  std::vector<std::pair<int, int>> control_edges;

  mlir::IRRewriter rewriter(block->getParentOp()->getContext());

  // Since we're modifying *block, we store integer offsets to block->begin().
  llvm::DenseMap<Operation*, int> control_nodes_at;
  std::vector<Operation*> control_nodes;