[SYCL][NFC] Optmize handler.hpp compilation for device [2/N] (#15698)

Moved some of the code under `#ifndef __SYCL_DEVICE_ONLY__`, because it
is related to various runtime checks, namely:

- `throwOnLocalAccessorMisuse`
- `checkIfPlaceholderIsBoundToHandler`
- `throwIfGraphAssociated`

This should reduce amount of template insantiations which are performed
during device compilation.

Note that implementation of a couple of `memcpy` methods were made
completely host-only.

Author: AlexeySachkov

sycl/include/sycl/ext/oneapi/memcpy2d.hpp

@@ -18,6 +18,7 @@ template <typename T, typename>
 void handler::ext_oneapi_memcpy2d(void *Dest, size_t DestPitch, const void *Src,
                                   size_t SrcPitch, size_t Width,
                                   size_t Height) {
+#ifndef __SYCL_DEVICE_ONLY__
   throwIfGraphAssociated<
       ext::oneapi::experimental::detail::UnsupportedGraphFeatures::
           sycl_ext_oneapi_memcpy2d>();
@@ -30,6 +31,7 @@ void handler::ext_oneapi_memcpy2d(void *Dest, size_t DestPitch, const void *Src,
     throw sycl::exception(sycl::make_error_code(errc::invalid),
                           "Source pitch must be greater than or equal "
                           "to the width specified in 'ext_oneapi_memcpy2d'");
+#endif
 
   // Get the type of the pointers.
   context Ctx = detail::createSyclObjFromImpl<context>(getContextImplPtr());