IVGCVSW-3418 Add Arm NN front end support for the new Stack layer

 * Added new StackLayer class
 * Made necessary changes to Descriptors, ILayerSupport, ILayerVisitor, etc.
 * Added unit tests

Signed-off-by: Matthew Jackson <matthew.jackson@arm.com>
Change-Id: Ieb97a928a342ffe1901c6058eb895711c358fd3d
diff --git a/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp b/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
index b02ab7b..6aff759 100644
--- a/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
+++ b/src/backends/backendsCommon/test/IsLayerSupportedTestImpl.hpp
@@ -408,6 +408,8 @@
 
 DECLARE_LAYER_POLICY_2_PARAM(Splitter)
 
+DECLARE_LAYER_POLICY_2_PARAM(Stack)
+
 DECLARE_LAYER_POLICY_2_PARAM(StridedSlice)
 
 DECLARE_LAYER_POLICY_1_PARAM(Subtraction)