[CPU] Reference node shape infer is now always called (#8517)

inference-engine/src/mkldnn_plugin/nodes/mkldnn_reference_node.cpp

@@ -105,3 +105,7 @@ void MKLDNNReferenceNode::executeDynamicImpl(mkldnn::stream strm) {
 bool MKLDNNReferenceNode::created() const {
     return getType() == Reference;
 }
+
+bool MKLDNNReferenceNode::needShapeInfer() const {
+    return true;
+}

inference-engine/src/mkldnn_plugin/nodes/mkldnn_reference_node.h

@@ -19,6 +19,7 @@ public:
     bool created() const override;
 
     std::vector<VectorDims> shapeInfer() const override;
+    bool needShapeInfer() const override;
     bool needPrepareParams() const override { return false; }
     void executeDynamicImpl(mkldnn::stream strm) override;