[Bug libstdc++/109150] std::fill should use __gnu_cxx::__is_scalar overloads for all scalars

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109150

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't think we're on the same page at all.

I'm intending to use the trait to mean that the assignment is known to call no
operation that is not trivial, as defined in the standard today.