fix compilation error in test_connection router and the warning in rr_graph2.cpp

Author: soheilshahrouz

vpr/src/route/rr_graph2.cpp

@@ -280,7 +280,7 @@ std::vector<int> get_seg_track_counts(int num_sets,
     // Keep assigning tracks until we use them up
     int assigned = 0;
     int imax = 0;
-    int size;
+    int size = 0;
     while (assigned < num_sets) {
         // Find current maximum demand
         double max = 0;

vpr/test/test_connection_router.cpp

@@ -150,12 +150,12 @@ TEST_CASE("connection_router", "[vpr]") {
     vpr_setup_clock_networks(vpr_setup, arch);
     auto det_routing_arch = &vpr_setup.RoutingArch;
     auto& router_opts = vpr_setup.RouterOpts;
-    t_graph_type graph_directionality;
+    e_graph_type graph_directionality;
 
     if (router_opts.route_type == GLOBAL) {
-        graph_directionality = GRAPH_BIDIR;
+        graph_directionality = e_graph_type::BIDIR;
     } else {
-        graph_directionality = (det_routing_arch->directionality == BI_DIRECTIONAL ? GRAPH_BIDIR : GRAPH_UNIDIR);
+        graph_directionality = (det_routing_arch->directionality == BI_DIRECTIONAL ? e_graph_type::BIDIR : e_graph_type::UNIDIR);
     }
 
     auto chan_width = init_chan(vpr_setup.RouterOpts.fixed_channel_width, arch.Chans, graph_directionality);