typedef orc::ObjectLinkingLayer<> ObjLayerT;
typedef orc::IRCompileLayer<ObjLayerT> CompileLayerT;
typedef orc::CompileOnDemandLayer<CompileLayerT, CompileCallbackMgr> CODLayerT;
typedef orc::ObjectLinkingLayer<> ObjLayerT;
typedef orc::IRCompileLayer<ObjLayerT> CompileLayerT;
typedef orc::CompileOnDemandLayer<CompileLayerT, CompileCallbackMgr> CODLayerT;