[mlir][sparse] Correcting the use of emplace_back

The emplace commands are variadic and should take all the constructor arguments directly, since they implicitly call the constructor themselves in order to avoid the cost of constructing and then moving/copying temporaries.

Reviewed By: aartbik

Differential Revision: https://reviews.llvm.org/D108670

Author: wrengr

mlir/lib/ExecutionEngine/SparseUtils.cpp

@@ -81,7 +81,7 @@ struct SparseTensor {
     assert(getRank() == ind.size());
     for (uint64_t r = 0, rank = getRank(); r < rank; r++)
       assert(ind[r] < sizes[r]); // within bounds
-    elements.emplace_back(Element<V>(ind, val));
+    elements.emplace_back(ind, val);
   }
   /// Sorts elements lexicographically by index.
   void sort() { std::sort(elements.begin(), elements.end(), lexOrder); }