[SYCL] Add a new header file with the reduction class definition (#1558)

The patch only adds the new header file, it does not implement
the reduction functionality in parallel_for() yet.

Inside sycl::intel namespace for the expressions like detail::something,
compiler looks for something in sycl::intel::detail instead of sycl::detail.
Expressions detail::something were changed to sycl::detail::something

Signed-off-by: Vyacheslav N Klochkov <[email protected]>

Author: v-klochkov

sycl/include/CL/sycl.hpp

@@ -26,6 +26,7 @@
 #include <CL/sycl/intel/builtins.hpp>
 #include <CL/sycl/intel/function_pointer.hpp>
 #include <CL/sycl/intel/group_algorithm.hpp>
+#include <CL/sycl/intel/reduction.hpp>
 #include <CL/sycl/intel/sub_group.hpp>
 #include <CL/sycl/item.hpp>
 #include <CL/sycl/kernel.hpp>

sycl/include/CL/sycl/intel/functional.hpp

@@ -53,6 +53,9 @@ template <> struct maximum<void> {
 #endif
 
 template <typename T = void> using plus = std::plus<T>;
+template <typename T = void> using bit_or = std::bit_or<T>;
+template <typename T = void> using bit_xor = std::bit_xor<T>;
+template <typename T = void> using bit_and = std::bit_and<T>;
 
 } // namespace intel