IVGCVSW-2632 Fix RefMerger from QAsymm8 types with different quantization parameters

Change-Id: Ie67ce4966c5e5fef618876b027292da429de1485
Signed-off-by: Ferran Balaguer <ferran.balaguer@arm.com>
diff --git a/src/backends/reference/workloads/CMakeLists.txt b/src/backends/reference/workloads/CMakeLists.txt
index 47e42f7..89aed91 100644
--- a/src/backends/reference/workloads/CMakeLists.txt
+++ b/src/backends/reference/workloads/CMakeLists.txt
@@ -25,6 +25,7 @@
     Gather.hpp
     Maximum.hpp
     Merger.hpp
+    Merger.cpp
     Minimum.hpp
     Pad.cpp
     Pad.hpp