Removed void overloads from reduction utilities

These were unused by dpctl

Author: ndgrigorian

dpctl/tensor/libtensor/include/utils/sycl_utils.hpp

@@ -96,8 +96,7 @@ template <typename T, typename Op> struct IsSyclOp
 {
     static constexpr bool value =
         detail::IsContained<Op, sycl_ops<std::remove_const_t<T>>>::value ||
-        detail::IsContained<Op, sycl_ops<std::add_const_t<T>>>::value ||
-        detail::IsContained<Op, sycl_ops<void>>::value;
+        detail::IsContained<Op, sycl_ops<std::add_const_t<T>>>::value;
 };
 
 /*! @brief Find the smallest multiple of supported sub-group size larger than
@@ -212,9 +211,7 @@ template <typename Op, typename T, typename = void> struct GetIdentity
 
 template <typename T, class Op>
 using IsMaximum = std::bool_constant<std::is_same_v<Op, sycl::maximum<T>> ||
-                                     std::is_same_v<Op, sycl::maximum<void>> ||
-                                     std::is_same_v<Op, Maximum<T>> ||
-                                     std::is_same_v<Op, Maximum<void>>>;
+                                     std::is_same_v<Op, Maximum<T>>>;
 
 template <typename Op, typename T>
 struct GetIdentity<Op, T, std::enable_if_t<IsMaximum<T, Op>::value>>
@@ -244,9 +241,7 @@ struct GetIdentity<Op,
 
 template <typename T, class Op>
 using IsMinimum = std::bool_constant<std::is_same_v<Op, sycl::minimum<T>> ||
-                                     std::is_same_v<Op, sycl::minimum<void>> ||
-                                     std::is_same_v<Op, Minimum<T>> ||
-                                     std::is_same_v<Op, Minimum<void>>>;
+                                     std::is_same_v<Op, Minimum<T>>>;
 
 template <typename Op, typename T>
 struct GetIdentity<Op, T, std::enable_if_t<IsMinimum<T, Op>::value>>
@@ -275,9 +270,8 @@ struct GetIdentity<Op,
 // Plus
 
 template <typename T, class Op>
-using IsPlus = std::bool_constant<
-    std::is_same_v<Op, sycl::plus<T>> || std::is_same_v<Op, sycl::plus<void>> ||
-    std::is_same_v<Op, std::plus<T>> || std::is_same_v<Op, std::plus<T>>>;
+using IsPlus = std::bool_constant<std::is_same_v<Op, sycl::plus<T>> ||
+                                  std::is_same_v<Op, std::plus<T>>>;
 
 // Identity