[Bug target/80881] Implement Windows native TLS

[lh_mouse at 126 dot com]

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

--- Comment #127 from LIU Hao <lh_mouse at 126 dot com> ---
(In reply to Eric Botcazou from comment #126)
> > Would you mind adding a sanity check that rejects dll{im,ex}port on
> > thread-local variables?
> 
> How does clang/LLVM deal with that?

https://github.com/llvm/llvm-project/commit/5da21da4f6d7c69bbd7b2e7cf3fbdfb337978f9c