message: minor tweaks for aarch64
diff: @@ -235,15 +235,15 @@ private:
  (StorageType) a2.coeff(Index2)... } } { ENOKI_CHKSCALAR }
  public:
  - Array1 low_() const {
  - Array1 result;
  + auto low_() const {
  + expr_t<Array1> result;
  ENOKI_CHKSCALAR for (size_t i = 0; i < Size1; ++i)
  result.coeff(i) = coeff(i);
  return result;
  }
  - Array2 high_() const {
  - Array2 result;
  + auto high_() const {
  + expr_t<Array2> result;
  ENOKI_CHKSCALAR for (size_t i = 0; i < Size2; ++i)
  result.coeff(i) = coeff(Size1 + i);
  return result;
  