[SYCL] Temporarily disable barrier_order for HIP and L0 backends (#1376)

The barrier_order test is sporadically failing for the HIP backend. This
has been reported in intel/llvm#7330.

Signed-off-by: Larsen, Steffen <[email protected]>

Author: steffenlarsen

SYCL/Basic/barrier_order.cpp

@@ -2,6 +2,9 @@
 // RUN: %CPU_RUN_PLACEHOLDER %t.out
 // RUN: %GPU_RUN_PLACEHOLDER %t.out
 
+// Temporarily disabled on HIP and L0 due to sporadic failures.
+// UNSUPPORTED: hip, level_zero
+
 #include <iostream>
 #include <stdlib.h>
 #include <sycl/sycl.hpp>