Fix translation bug: The old code really checks for the presense of a node, not an edge in glift and flatten.

Add back statement that inserts nodes in order in opt_expr.cc.

passes/cmds/glift.cc

@@ -582,7 +582,7 @@ struct GliftPass : public Pass {
 			for (auto cell : module->selected_cells()) {
 				RTLIL::Module *tpl = design->module(cell->type);
 				if (tpl != nullptr) {
-					if (!topo_modules.has_edges(tpl))
+					if (!topo_modules.has_node(tpl))
 						worklist.push_back(tpl);
 					topo_modules.edge(tpl, module);
 					non_top_modules.insert(cell->type);