message: Replaced unused dyn_cast with isa in GraphPruning pass. (NFC)
diff: @@ -53,7 +53,7 @@ void PruneGraph(GraphOp graph) {
  while (!ops_to_visit.empty()) {
  Operation* op = ops_to_visit.pop_back_val();
  - if (auto island_op = llvm::dyn_cast<IslandOp>(op)) {
  + if (llvm::isa<IslandOp>(op)) {
  // Visit island and island inner ops operands.
  op->walk([&](Operation* inner_op) { visit_op(inner_op); });
  continue;
  