Fix bug introduced by #2238 on master (#2514)

* Fix bug introduced by #2238

* Apply style.

src/ngraph/runtime/cpu/cpu_external_function.cpp

@@ -1918,6 +1918,8 @@ string runtime::cpu::CPU_ExternalFunction::strip_comments(const string& s)
     return out.str();
 }
 
+#endif
+
 std::unordered_set<descriptor::Tensor*>&
     runtime::cpu::CPU_ExternalFunction::get_tensor_set(descriptor::Tensor* output_tensor)
 {
@@ -1928,5 +1930,3 @@ std::unordered_set<descriptor::Tensor*>&
     NGRAPH_ASSERT(output_buffer_it != bufferID_to_tensorSets.end());
     return output_buffer_it->second.second;
 }
-
-#endif

src/ngraph/runtime/cpu/cpu_external_function.hpp

@@ -203,9 +203,6 @@ namespace ngraph
                 std::string emit_op_as_function(const Node&, const std::string& function_name);
                 std::string strip_comments(const std::string&);
 
-                std::unordered_set<descriptor::Tensor*>&
-                    get_tensor_set(descriptor::Tensor* output_tensor);
-
                 std::unique_ptr<codegen::Compiler> m_compiler;
                 std::unique_ptr<codegen::ExecutionEngine> m_execution_engine;
 
@@ -216,6 +213,8 @@ namespace ngraph
                 // so they don't get freed before we are done with them
                 std::vector<std::shared_ptr<Node>> m_active_constants;
 #endif
+                std::unordered_set<descriptor::Tensor*>&
+                    get_tensor_set(descriptor::Tensor* output_tensor);
 
                 std::shared_ptr<ngraph::Function> m_function;
                 bool m_release_function;