undo change in launch_policy_lmem.cpp

Author: YixingZhang007

sycl/test-e2e/syclcompat/launch/launch_policy_lmem.cpp

@@ -26,6 +26,10 @@
 // UNSUPPORTED: linux && opencl && (gpu-intel-gen12 || gpu-intel-dg2 || arch-intel_gpu_pvc)
 // UNSUPPORTED-TRACKER: https://github.com/intel/llvm/issues/15275
 
+// Flaky pass/fail behaviour.
+// UNSUPPORTED: spirv-backend
+// UNSUPPORTED-TRACKER: CMPLRLLVM-64705
+
 #include <sycl/detail/core.hpp>
 #include <sycl/ext/oneapi/properties/properties.hpp>
 #include <sycl/group_barrier.hpp>