int num_args = cloned_branches[0].getNumArguments();
  llvm::BitVector used_args(num_args);
  for (func::FuncOp func : branches) {
    for (BlockArgument arg : func.getArguments()) {
      if (!arg.use_empty()) used_args.set(arg.getArgNumber());
    }
  }

  // There are some unused args that we can drop. Also drop the corresponding
  // input operand.
  if (used_args.count() != num_args) {

    cluster_args+=(
      "--certificate-authority=${CA_CERT}"
      "--embed-certs=true"
    )
  fi

  local user_args=()
  if [[ -n "${KUBE_BEARER_TOKEN:-}" ]]; then
    user_args+=(
     "--token=${KUBE_BEARER_TOKEN}"
    )
  elif [[ -n "${KUBE_USER:-}" && -n "${KUBE_PASSWORD:-}" ]]; then
    user_args+=(
     "--username=${KUBE_USER}"
     "--password=${KUBE_PASSWORD}"
    )
  fi

      // TODO(b/246310765): This doesn't fully handle recursion.
      if (!use_count[arg.getArgNumber()]) unused_args.set(arg.getArgNumber());
    }

    EraseReturnOperands(region, unused_results);
    func.eraseResults(unused_results);
    func.eraseArguments(unused_args);

    args_to_erase.insert(std::make_pair(op, unused_args));
    results_to_erase.insert(std::make_pair(op, unused_results));

                return;
            }
            List<Integer> argsMap = new ArrayList<Integer>(expression.getArguments().size());
            boolean usesArgs = mapArgs(paramNames, expression, argsMap);
            if (!usesArgs) {
                // Don't need to do parameter substitution, return the value of the expression after macro expanding it
                expression = expression.asMacroExpansion();

		p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt]
		s.UseArgs(8) // space used in callee args area by assembly stubs

	case ssa.Op386LoweredPanicExtendA, ssa.Op386LoweredPanicExtendB, ssa.Op386LoweredPanicExtendC:
		p := s.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = ssagen.ExtendCheckFunc[v.AuxInt]
		s.UseArgs(12) // space used in callee args area by assembly stubs

		p := s.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt]
		s.UseArgs(16) // space used in callee args area by assembly stubs
	case ssa.OpS390XFLOGR, ssa.OpS390XPOPCNT,
		ssa.OpS390XNEG, ssa.OpS390XNEGW,
		ssa.OpS390XMOVWBR, ssa.OpS390XMOVDBR:
		p := s.Prog(v.Op.Asm())

		p := s.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt]
		s.UseArgs(16) // space used in callee args area by assembly stubs

	case ssa.OpPPC64LoweredNilCheck:
		if buildcfg.GOOS == "aix" {
			// CMP Rarg0, $0
			// BNE 2(PC)
			// STW R0, 0(R0)

		}
	}

	if s.maxarg < v.AuxInt {
		s.maxarg = v.AuxInt
	}
}

// UseArgs records the fact that an instruction needs a certain amount of
// callee args space for its use.
func (s *State) UseArgs(n int64) {
	if s.maxarg < n {
		s.maxarg = n
	}
}

// fieldIdx finds the index of the field referred to by the ODOT node n.