[Bug target/80881] Implement Windows native TLS

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80881

--- Comment #121 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I have bootstrapped GCC on {i686,x86_64}-w64-mingw32 and seen no issue so
> far.
> 
> Building more packages now. (cmake, boost, gdb, ...)

Thanks.  FWIW AdaCore builds its entire set of software with native TLS enabled
on both platforms now.