The r16-3435-gbbc0e70b610f19 change (for LWG 4294) needs to be applied
to the debug mode __gnu_debug::bitset as well as the normal one.
libstdc++-v3/ChangeLog:
PR libstdc++/121046
* include/debug/bitset (bitset(const CharT*, ...)): Add
constraints on CharT type.