[SYCL][CUDA] Disable subgroup shuffle_fp64 test for CUDA (#1626)

The CUDA backend is failing the shuffle_fp64 after recent additions.
This has been reported in intel/llvm#8516 and
this commit disables the test for CUDA while it is fixed.

Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>

Author: steffenlarsen

SYCL/SubGroup/shuffle_fp64.cpp

@@ -3,6 +3,10 @@
 // RUN: %GPU_RUN_PLACEHOLDER %t.out
 // RUN: %ACC_RUN_PLACEHOLDER %t.out
 //
+// Temporarily disabled for CUDA due to failure reported in
+// https://github.com/intel/llvm/issues/8516
+// UNSUPPORTED: cuda
+//
 //==------- shuffle_fp64.cpp - SYCL sub_group shuffle test -----*- C++ -*---==//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.