Add __device__ to needful functions for promote-free.

src/device_util.cpp

@@ -34,8 +34,8 @@ THE SOFTWARE.
  This is the best place to put them because the device
  global variables need to be initialized at the start.
 */
-ADDRESS_SPACE_1 char gpuHeap[SIZE_OF_HEAP];
-ADDRESS_SPACE_1 uint32_t gpuFlags[NUM_PAGES];
+__device__ ADDRESS_SPACE_1 char gpuHeap[SIZE_OF_HEAP];
+__device__ ADDRESS_SPACE_1 uint32_t gpuFlags[NUM_PAGES];
 
 __device__ void *__hip_hc_malloc(size_t size)
 {