[SYCL] Align handler::require API with the SYCL specification (#2325)

This fix corrects the definition of the handler::require API in our headers to match the SYCL specification.
The SYCL spec defines the accessor parameter of "require" to be passed by value. Our headers defined the API to take an accessor by reference.
This PR changes the accessor parameter from reference to value.

Signed-off-by: rdeodhar <[email protected]>

Author: rdeodhar

sycl/include/CL/sycl/handler.hpp

@@ -757,8 +757,9 @@ class __SYCL_EXPORT handler {
   /// \param Acc is a SYCL accessor describing required memory region.
   template <typename DataT, int Dims, access::mode AccMode,
             access::target AccTarget>
-  void require(accessor<DataT, Dims, AccMode, AccTarget,
-                        access::placeholder::true_t> &Acc) {
+  void
+  require(accessor<DataT, Dims, AccMode, AccTarget, access::placeholder::true_t>
+              Acc) {
 #ifndef __SYCL_DEVICE_ONLY__
     associateWithHandler(&Acc, AccTarget);
 #else