Fixing LLVM error on TensorMorphingSycl.h on GPU; fixing int64_t crash for tensor_broadcast_sycl on GPU; adding get_sycl_supported_devices() on syclDevice.h.

unsupported/Eigen/CXX11/src/Tensor/TensorReduction.h

@@ -13,6 +13,7 @@
 
 namespace Eigen {
 
+
 /** \class TensorReduction
   * \ingroup CXX11_Tensor_Module
   *
@@ -691,6 +692,11 @@ struct TensorEvaluator<const TensorReductionOp<Op, Dims, ArgType, MakePointer_>,
   template <int NPT, typename S, typename R, typename I> friend void internal::OuterReductionKernel(R, const S, I, I, typename S::CoeffReturnType*);
 #endif
 
+#if defined(EIGEN_USE_SYCL)
+ template < typename HostExpr_, typename PlaceHolderExpr_, typename FunctorExpr_, typename Tuple_of_Acc_, typename Dims_, typename Op_, typename Index_> friend class TensorSycl::internal::ReductionFunctor;
+
+#endif
+
   template <typename S, typename O, typename D> friend struct internal::InnerReducer;
 
   // Returns the Index in the input tensor of the first value that needs to be