message: Use RANGES_CONSTEXPR_IF in generator.cpp
diff: @@ -61,7 +61,7 @@ private:
  (is_copy_constructible_or_ref<ranges::range_reference_t<V>>()))
  static generator_for<V> impl(V v)
  {
  - if /* constexpr */ (ranges::sized_range<V>)
  + if(RANGES_CONSTEXPR_IF(ranges::sized_range<V>))
  co_await static_cast<ranges::experimental::generator_size>((std::size_t)ranges::distance(v));
  auto first = ranges::begin(v);
  auto const last = ranges::end(v);
  @@ -165,7 +165,7 @@ meta::invoke<
  ranges::indirect_result_t<F &, ranges::iterator_t<V>>>
  transform(V view, F f)
  {
  - if /* constexpr */ (ranges::sized_range<V>)
  + if(RANGES_CONSTEXPR_IF(ranges::sized_range<V>))
  co_await static_cast<ranges::experimental::generator_size>((std::size_t) ranges::distance(view));
  RANGES_FOR(auto &&i, view)
  co_yield ranges::invoke(f, i);
  