COMPMID-1725: Implement Pack

Change-Id: I13f6e4c600f39355f69e015409bf30dafdc5e3aa
Reviewed-on: https://review.mlplatform.org/332
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/arm_compute/runtime/CL/CLFunctions.h b/arm_compute/runtime/CL/CLFunctions.h
index e68e719..d340ce1 100644
--- a/arm_compute/runtime/CL/CLFunctions.h
+++ b/arm_compute/runtime/CL/CLFunctions.h
@@ -125,6 +125,7 @@
 #include "arm_compute/runtime/CL/functions/CLSoftmaxLayer.h"
 #include "arm_compute/runtime/CL/functions/CLSpaceToBatchLayer.h"
 #include "arm_compute/runtime/CL/functions/CLSplit.h"
+#include "arm_compute/runtime/CL/functions/CLStackLayer.h"
 #include "arm_compute/runtime/CL/functions/CLStridedSlice.h"
 #include "arm_compute/runtime/CL/functions/CLTableLookup.h"
 #include "arm_compute/runtime/CL/functions/CLThreshold.h"