[llvm] [CodeGen] Diagnose unsupported landingpad result types instead of asserting (PR #223205)

[Akash Manna via llvm-commits]

akash-manna-sky wrote:

> Looks good, but in the future, please author pr descriptions without agent assistance. It reads like agent-speak ("shape", "takes down whole compiler").
> 
> We could also drop the release note. I consider this a quality of implementation improvement.

Thanks! @rnk, I think we can keep the release note. Can you please merge if for me?

https://github.com/llvm/llvm-project/pull/223205