CallOpType call_op, func::FuncOp callee, ModuleOp module,
    bool vars_initialized,
    llvm::SmallDenseMap<llvm::StringRef, PartitionedCallLiftingInfo>*
        lifted_callees) {
  auto emplace_res = lifted_callees->try_emplace(callee.getName(),
                                                 PartitionedCallLiftingInfo());
  if (emplace_res.second) {
    // Unseen callee. Perform resource lifting on it.