IVGCVSW-2316 Add reference implementation and unit tests for Debug

Change-Id: Ib2e5de2a057da57ef77a9f5c4367d699d4773294
diff --git a/src/backends/reference/backend.mk b/src/backends/reference/backend.mk
index 66675bd..d868069 100644
--- a/src/backends/reference/backend.mk
+++ b/src/backends/reference/backend.mk
@@ -15,6 +15,7 @@
         workloads/BatchToSpaceNd.cpp \
         workloads/Broadcast.cpp \
         workloads/ConvImpl.cpp \
+        workloads/Debug.cpp \
         workloads/ElementwiseFunction.cpp \
         workloads/FullyConnected.cpp \
         workloads/Mean.cpp \
@@ -33,6 +34,7 @@
         workloads/RefConvertFp32ToFp16Workload.cpp \
         workloads/RefConvolution2dFloat32Workload.cpp \
         workloads/RefConvolution2dUint8Workload.cpp \
+        workloads/RefDebugWorkload.cpp \
         workloads/RefDepthwiseConvolution2dFloat32Workload.cpp \
         workloads/RefDepthwiseConvolution2dUint8Workload.cpp \
         workloads/RefElementwiseWorkload.cpp \