llvm::ArrayRef<BlockArgument> GetPackedBlockArguments();
    llvm::ArrayRef<BlockArgument> GetReplicatedBlockArguments();
    bool IsReplicatedBlockArgument(BlockArgument block_arg);
    bool IsPackedBlockArgument(BlockArgument block_arg);
    unsigned GetReplicaOperandIndexForBlockArgument(BlockArgument block_arg, unsigned replica);
    Value GetReplicaOperandForBlockArgument(BlockArgument block_arg, unsigned replica);

  assert(block_arg.getOwner() == &GetBody());
  return block_arg.getArgNumber() < GetNumReplicatedBlockArguments();
}

// Checks if a block argument is packed (forwarding a packed input).
bool ReplicateOp::IsPackedBlockArgument(BlockArgument block_arg) {
  return !IsReplicatedBlockArgument(block_arg);
}

// Returns the operand index of the operand being forwarded as a