mkldnn emitter - fixed memory leak. (#608)

* fixed memory leak.

* clang format.

src/ngraph/runtime/cpu/mkldnn_emitter.cpp

@@ -25,6 +25,12 @@
 
 using namespace ngraph::runtime::cpu;
 
+MKLDNNEmitter::~MKLDNNEmitter()
+{
+    for (auto p : m_mkldnn_primitives)
+        delete p;
+}
+
 const std::vector<mkldnn::primitive*>& MKLDNNEmitter::get_mkldnn_primitives() const
 {
     return m_mkldnn_primitives;

src/ngraph/runtime/cpu/mkldnn_emitter.hpp

@@ -39,6 +39,8 @@ namespace ngraph
             {
             public:
                 MKLDNNEmitter() {}
+                ~MKLDNNEmitter();
+
                 const std::vector<mkldnn::primitive*>& get_mkldnn_primitives() const;
 
                 size_t insert_primitive(mkldnn::primitive* primitive);