/// possible.
/// The function currently asserts that the `result_type` to be a f32 tensor
/// type.
/// TODO: Extend this function to handle integral tensor for ops like
/// "tfl.logical_not".
Attribute ConstFoldUnaryOp(Type result_type, Attribute operand,
                           llvm::function_ref<APFloat(APFloat)> calculate) {
  assert(IsF32ShapedType(result_type) || IsBF16ShapedType(result_type));