}

namespace {
class FoldConstantIfRegionOp : public OpRewritePattern<TF::IfRegionOp> {
 public:
  explicit FoldConstantIfRegionOp(MLIRContext* context)
      : OpRewritePattern<TF::IfRegionOp>(context) {}
  LogicalResult matchAndRewrite(TF::IfRegionOp op,
                                PatternRewriter& rewriter) const override;
};

LogicalResult FoldConstantIfRegionOp::matchAndRewrite(