[Bug c/118765] c23 tag matching broken for multiple redeclarations of unions and typedefs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118765

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 60390
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60390&action=edit
simplified testcase

If we don't have WORKS defined, then GCC works. Once you add another definition
of `union bar` or `q_t` after the 2nd one compiling starts to fail. That is the
3rd definition of either will fail but 2 will work.