[clang] [ObjC] Check entire chain of superclasses to see if class layout is statically known (PR #81335)

[via cfe-commits]

AtariDreams wrote:

> > @JOE1994 Thoughts on this?
> 
> 
> 
> I'm not an ideal reviewer for this as I'm unfamiliar with ObjC side of Clang,
> 
> but I'll come back to leave a review and to help merge this if this doesn't get merged by the end of today :)

Alright. Thank you so much!

https://github.com/llvm/llvm-project/pull/81335