[clang] [Clang] Implement CWG3005 Function parameters should never be name-independent (PR #138245)

[Erich Keane via cfe-commits]

erichkeane wrote:

> > THIS example should also be ill-formed by CWG3005:
> > ```
> > 
> > struct S3 {
> >    union {
> >      int _;
> >      };
> >     int _; // error, the one in the union isn't type independent
> > };
> > ```
> 
> This is CWG2764 - I'll do that in a separate PR (and I need to open another issue because I think the wording fails to implement the intent)

Ah!  SGTM!

https://github.com/llvm/llvm-project/pull/138245