New VT swap for critical cells near end of setup fixing

src/rsz/src/RepairSetup.cc

@@ -1183,6 +1183,12 @@ Slack RepairSetup::getInstanceSlack(Instance* inst)
         const Slack pin_slack = sta_->vertexSlack(vertex, max_);
         worst_slack = std::min(worst_slack, pin_slack);
       }
+      // Bidi pins may have different slacks at split pins
+      Vertex* d_vertex = graph_->pinDrvrVertex(pin);
+      if (d_vertex && d_vertex != vertex) {
+        const Slack pin_slack = sta_->vertexSlack(d_vertex, max_);
+        worst_slack = std::min(worst_slack, pin_slack);
+      }
     }
   }
   delete pin_iter;