Simplex work estimates (#856)

This PR converts dual simplex to use manual work estimates to simplify the code and ease maintenance.

 Work estimates are also calculated for more functions.

Authors:
  - Chris Maes (https://github.com/chris-maes)

Approvers:
  - Alice Boucher (https://github.com/aliceb-nv)

URL: #856

Author: chris-maes

cpp/src/barrier/barrier.cu

@@ -1390,7 +1390,7 @@ class iteration_data_t {
     // v = alpha * A * w + beta * v = alpha * A * Dinv * A^T * y + beta * v
     matrix_vector_multiply(A, alpha, w, beta, v);
     if (debug) {
-      printf("||A|| = %.16e\n", vector_norm2<i_t, f_t>(A.x.underlying()));
+      printf("||A|| = %.16e\n", vector_norm2<i_t, f_t>(A.x));
       printf("||w|| = %.16e\n", vector_norm2<i_t, f_t>(w));
       printf("||v|| = %.16e\n", vector_norm2<i_t, f_t>(v));
     }

cpp/src/barrier/cusparse_view.cu

@@ -159,9 +159,9 @@ cusparse_view_t<i_t, f_t>::cusparse_view_t(raft::handle_t const* handle_ptr,
   A_indices_ = device_copy(indices, handle_ptr->get_stream());
   A_data_    = device_copy(data, handle_ptr->get_stream());
 
-  A_T_offsets_ = device_copy(A.col_start.underlying(), handle_ptr->get_stream());
-  A_T_indices_ = device_copy(A.i.underlying(), handle_ptr->get_stream());
-  A_T_data_    = device_copy(A.x.underlying(), handle_ptr->get_stream());
+  A_T_offsets_ = device_copy(A.col_start, handle_ptr->get_stream());
+  A_T_indices_ = device_copy(A.i, handle_ptr->get_stream());
+  A_T_data_    = device_copy(A.x, handle_ptr->get_stream());
 
   cusparseCreateCsr(&A_,
                     rows,