Remove mkldnn preamble from generated code. No longer needed with mkldnnn emitter

src/ngraph/runtime/cpu/cpu_emitter.cpp

@@ -121,13 +121,6 @@ static string eigen_matrix_format(const ngraph::Shape& shape, const ngraph::Stri
     return ss.str();
 }
 
-void runtime::cpu::CPU_Emitter::emit_mkldnn_preamble(codegen::CodeWriter& writer)
-{
-    writer << "// MKLDNN Preamble\n";
-    writer << "#include <mkldnn.hpp>\n";
-    writer << "using namespace mkldnn;\n\n";
-}
-
 namespace ngraph
 {
     namespace runtime
@@ -3194,9 +3187,6 @@ namespace ngraph
             template <>
             void CPU_Emitter::EMITTER_DECL(ngraph::op::ReluBackprop)
             {
-                const auto& arg_shape = args[0].get_shape();
-                const auto& result_shape = out[0].get_shape();
-
                 if (runtime::cpu::mkldnn_utils::use_mkldnn_kernel(node))
                 {
                     auto& mkldnn_emitter = external_function->get_mkldnn_emitter();

src/ngraph/runtime/cpu/cpu_emitter.hpp

@@ -58,8 +58,6 @@ namespace ngraph
                 {
                 }
 
-                static void emit_mkldnn_preamble(codegen::CodeWriter& writer);
-
             private:
                 static std::string emit_vector(const TensorViewWrapper&,
                                                const std::string& name = "");

src/ngraph/runtime/cpu/cpu_external_function.cpp

@@ -291,18 +291,6 @@ void runtime::cpu::CPU_ExternalFunction::compile()
 
     codegen::CodeWriter writer;
 
-    bool include_mkldnn_headers = false;
-    for (shared_ptr<Function> current_function : pass_manager.get_state().get_functions())
-    {
-        for (shared_ptr<Node> node : current_function->get_ordered_ops())
-        {
-            if (ngraph::runtime::cpu::mkldnn_utils::IsMKLDNNOp(*node))
-            {
-                include_mkldnn_headers = true;
-            }
-        }
-    }
-
     writer +=
         R"(// Generated by the nGraph CPU backend
 #include <cmath>
@@ -352,11 +340,6 @@ using namespace ngraph::runtime;
         writer << "#include <tbb/flow_graph.h>\n";
     }
 
-    if (include_mkldnn_headers)
-    {
-        runtime::cpu::CPU_Emitter::emit_mkldnn_preamble(writer);
-    }
-
     string pch_header_source = writer.get_code();
 
     // The "dso_handle" symbol is required by __cxa_atexit()