GitHub #734 Add ExecuteNetwork support for S64 bit output

* Add Signed 64 bit support for Output and Debug Layers

Signed-off-by: John Mcloughlin <john.mcloughlin@arm.com>
Change-Id: I991c2d5f1067b16d0fac362e7406305fbe90d034
diff --git a/src/backends/reference/RefWorkloadFactory.cpp b/src/backends/reference/RefWorkloadFactory.cpp
index c4d9583..ad6ec9a 100644
--- a/src/backends/reference/RefWorkloadFactory.cpp
+++ b/src/backends/reference/RefWorkloadFactory.cpp
@@ -45,6 +45,10 @@
     }
     return false;
 }
+bool IsSigned64(const WorkloadInfo& info)
+{
+    return IsDataType<DataType::Signed64>(info);
+}
 bool IsSigned32(const WorkloadInfo& info)
 {
     return IsDataType<DataType::Signed32>(info);
@@ -263,6 +267,10 @@
             {
                 return std::make_unique<RefDebugSigned32Workload>(*debugQueueDescriptor, info);
             }
+            if (IsSigned64(info))
+            {
+                return std::make_unique<RefDebugSigned64Workload>(*debugQueueDescriptor, info);
+            }
             return MakeWorkload<RefDebugFloat32Workload, RefDebugQAsymmU8Workload>(*debugQueueDescriptor, info);
         }
         case LayerType::DepthToSpace: