CPU Direct Execution: Add implemented builders to the build script

and track callees within the ExternalFunction

src/ngraph/runtime/cpu/CMakeLists.txt

@@ -28,9 +28,24 @@ set(SRC
     cpu_tensor_view.cpp
     cpu_tracing.cpp
     builder/avg_pool.cpp
+    builder/batch_norm.cpp
+    builder/broadcast.cpp
+    builder/concat.cpp
+    builder/convert.cpp
     builder/convert_layout.cpp
     builder/convolution.cpp
+    builder/dot.cpp
+    builder/function_call.cpp
+    builder/matmul_bias.cpp
+    builder/max.cpp
+    builder/max_pool.cpp
+    builder/min.cpp
     builder/reshape.cpp
+    builder/reverse.cpp
+    builder/reverse_sequence.cpp
+    builder/select.cpp
+    builder/select_and_scatter.cpp
+    builder/sum.cpp
     kernel/eigen_thread_pool.cpp
     kernel/pad.cpp
     kernel/reduce_max.cpp

src/ngraph/runtime/cpu/cpu_external_function.hpp

@@ -105,6 +105,11 @@ namespace ngraph
                 {
                     return executor;
                 }
+                std::unordered_map<std::string, std::shared_ptr<CPU_ExternalFunction>>&
+                    get_callees()
+                {
+                    return callees;
+                }
                 bool is_direct_execution() const { return m_direct_execution; }
             protected:
                 void build();
@@ -167,6 +172,7 @@ namespace ngraph
                 std::unordered_map<std::string, bool> tensor_stale;
                 std::unordered_map<std::string, size_t> intermediates_offsets;
                 std::unordered_map<std::string, size_t> function_input_index, function_output_index;
+                std::unordered_map<std::string, std::shared_ptr<CPU_ExternalFunction>> callees;
                 bool m_is_built;
                 bool m_direct_execution;
             };