Replace util::compare with extended std::equal

[neoblizz]

We can extend the std::equal to support device iterators.

template< class ExecutionPolicy, class ForwardIt1, class ForwardIt2,
          class BinaryPredicate >
bool equal( ExecutionPolicy&& policy, ForwardIt1 first1, ForwardIt1 last1,
            ForwardIt2 first2, BinaryPredicate p );