[Bug libstdc++/119748] std::string::string(InputIterator, InputIterator) rejects volatile charT* as iterator

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119748

--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
The _S_copy_range(pointer __p, _Rg&& __rg, size_type __n) help committed
yesterday also needs to be fixed for the contiguous_range branch.