RewritePatternSet patterns(ctx);
  populateWithGenerated(patterns);
  (void)applyPatternsAndFoldGreedily(func, std::move(patterns));

  // Convert unsupported ops to Flex ops.
  auto tf_dialect = ctx->getLoadedDialect<TF::TensorFlowDialect>();
  func.walk([&](Operation *op) {
    if (op->getDialect() != tf_dialect) return;
    if (IsAllowListedOp(op)) return;
    if (op->hasAttr(kNoFallbackAttr)) {

  FunctionLibraryDefinition temp_flib_def(OpRegistry::Global(),
                                          FunctionDefLibrary());
  llvm::SmallDenseSet<FuncOp> visited_functions;
  auto tf_dialect = module.getContext()->getLoadedDialect("tf");
  // Construct SymbolTable to enable cheap function lookups. The cost
  // of constructing the table is offset by the number of queries.
  SymbolTable symbol_table(module);

  FunctionLibraryDefinition temp_flib_def(OpRegistry::Global(),
                                          FunctionDefLibrary());
  llvm::SmallDenseSet<FuncOp> visited_functions;
  auto tf_dialect = module.getContext()->getLoadedDialect("tf");
  // Construct SymbolTable to enable cheap function lookups. The cost
  // of constructing the table is offset by the number of queries.
  SymbolTable symbol_table(module);

      }
    }
  }

  island_op.erase();
  return success();
}

void ReplicateToIslandPass::runOnOperation() {
  const Dialect* tf_dialect = getContext().getLoadedDialect("tf");
  if (!tf_dialect) {
    getOperation().emitError() << "'tf' dialect is not registered";
    return signalPassFailure();
  }

  // Find islands with a single `tf_device.replicate` and create individual

              << " outside compilation regions.";
  }
}

void MarkOpsForOutsideCompilation::runOnOperation() {
  auto module = getOperation();
  const Dialect* tf_dialect = getContext().getLoadedDialect("tf");
  if (!tf_dialect) {
    getOperation().emitError() << "'tf' dialect is not registered";
    return signalPassFailure();
  }
  RewritePatternSet patterns(&getContext());