[PATCH] libstdc++: Implement missing P0896 changes to reverse_view [PR100639]

[Jonathan Wakely]

On 18/05/21 15:52 -0400, Patrick Palka via Libstdc++ wrote:
>This implements the P0896 changes to reverse_view's member types
>value_type, difference_type and reference in C++20 mode, which fixes
>problems taking the reverse_iterator of an iterator with a non-integral
>difference_type (such as iota_view<long long>).
>
>Tested on x86_64-pc-linux-gnu, does this look OK for trunk and perhaps
>10/11?

Yes for all.