[Bug libstdc++/83830] New: has_unique_object_representations_v is missing

[rs2740 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83830

            Bug ID: 83830
           Summary: has_unique_object_representations_v is missing
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rs2740 at gmail dot com
  Target Milestone: ---

libstdc++ has the trait but not the _v form, which was added by the editor per
NB comment US-9 on the C++17 CD, see
https://github.com/cplusplus/draft/commit/97058f9cc925cd9a9e818545cad4e1c198d714cb.