Method swap

test-app/runtime/src/main/cpp/robin_hood.h:451–455

    }

    void swap(BulkPoolAllocator<T, MinNumAllocs, MaxNumAllocs>& other) noexcept {
        using std::swap;
        swap(mHead, other.mHead);
        swap(mListForFree, other.mListForFree);
    }

private:
    // iterates the list of allocated memory to calculate how many to alloc next.