[clang] [Clang] Support using boolean vectors in ternary operators (PR #154145)

[Erich Keane via cfe-commits]

erichkeane wrote:

> > > errors, but I think to fold it directly we'd need a dedicated builtin. But I'm not a master of the clang AST.
> > 
> > 
> > We shouldn't need a builtin, we should just be able to handle the AST nodes directly in ExprConstant.cpp.
> 
> Ah, right. That doesn't work, but it seems like the normal handling doesn't work there either so I'll punt fixing this for another PR https://godbolt.org/z/rTx5n7fao.

I expected as much :)  This suggestion:

>     Another thing to look at is handling these operations in ExprConstant.cpp so that we handle them in constexpr too!

was intended as a future direction (or a nerd-snipe 'while you are here?') sorry if that wasn't clear enough 


https://github.com/llvm/llvm-project/pull/154145