Port NEFullyConnectedLayer to memory injecting interface

Resolves: COMPMID-4501

Change-Id: Ib61b3d06974009e501b3fb86467735427e13a94a
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5931
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/src/core/helpers/MemoryHelpers.h b/src/core/helpers/MemoryHelpers.h
index 60a2dbf..a410526 100644
--- a/src/core/helpers/MemoryHelpers.h
+++ b/src/core/helpers/MemoryHelpers.h
@@ -116,5 +116,25 @@
     }),
     workspace.end());
 }
+
+/** Utility function to release tensors with lifetime marked as Prepare */
+template <typename TensorType>
+void release_temporaries(const experimental::MemoryRequirements &mem_reqs,
+                         WorkspaceData<TensorType>              &workspace)
+{
+    for(auto &ws : workspace)
+    {
+        const int slot = ws.slot;
+        for(auto &m : mem_reqs)
+        {
+            if(m.slot == slot && m.lifetime == experimental::MemoryLifetime::Prepare)
+            {
+                auto tensor = ws.tensor.get();
+                tensor->allocator()->free();
+                break;
+            }
+        }
+    }
+}
 } // namespace arm_compute
 #endif /* SRC_COMMON_MEMORY_HELPERS_H */