[SYCL][NFC] Remove unused handler helper (#20963)

Author: againull

sycl/include/sycl/handler.hpp

@@ -248,7 +248,6 @@ template <typename Type> struct get_kernel_wrapper_name_t {
 };
 
 __SYCL_EXPORT device getDeviceFromHandler(handler &);
-device_impl &getDeviceImplFromHandler(handler &);
 
 // Checks if a device_global has any registered kernel usage.
 __SYCL_EXPORT bool isDeviceGlobalUsedInKernel(const void *DeviceGlobalPtr);
@@ -2640,7 +2639,6 @@ class __SYCL_EXPORT handler {
             typename PropertyListT>
   friend class accessor;
   friend device detail::getDeviceFromHandler(handler &);
-  friend detail::device_impl &detail::getDeviceImplFromHandler(handler &);
 
   template <typename DataT, int Dimensions, access::mode AccessMode,
             access::target AccessTarget, access::placeholder IsPlaceholder>

sycl/source/handler.cpp

@@ -57,13 +57,6 @@ markBufferAsInternal(const std::shared_ptr<buffer_impl> &BufImpl) {
   BufImpl->markAsInternal();
 }
 
-#ifdef __INTEL_PREVIEW_BREAKING_CHANGES
-// TODO: Check if two ABI exports below are still necessary.
-#endif
-device_impl &getDeviceImplFromHandler(handler &CGH) {
-  return getSyclObjImpl(CGH)->get_device();
-}
-
 device getDeviceFromHandler(handler &CGH) {
   return createSyclObjFromImpl<device>(getSyclObjImpl(CGH)->get_device());
 }