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

[via cfe-commits]

AZero13 wrote:

> @AZero13 Do you have any news or plans regarding LTO support? We have several projects with substantial existing Objective-C code, and the performance benefits of LTO support could be significant. I would be interested in taking on a portion or the entirety of this work if it is not currently on your priority list.

If you can do it, go for it!



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