Method swap

bolt/exec/prefixsort/PrefixSortAlgorithm.h:192–198

 private:
  FOLLY_ALWAYS_INLINE void swap(
      const detail::PrefixSortIterator& lhs,
      const detail::PrefixSortIterator& rhs) const {
    simd::memcpy(swapBuffer_, *lhs, entrySize_);
    simd::memcpy(*lhs, *rhs, entrySize_);
    simd::memcpy(*rhs, swapBuffer_, entrySize_);
  }

  FOLLY_ALWAYS_INLINE void rangeSwap(
      const detail::PrefixSortIterator& start1,