[llvm] [SelectionDAG] Not issue TRAP node if naked function (PR #132147)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

> So if we change the return type of naked to i32,
> 
> ```
> define dso_local i32 @naked() naked "frame-pointer"="all" {
>   call void @main()
>   unreachable
> }
> ```

Can we just say you're not allowed to do this?  Anything other than an inline asm statement in a naked function has dubious semantics.  Even on x86, the generated code for the given example is broken.

> I have a couple issues with the current implementation / existence of the TrapOnUnreachable option

I don't disagree, but everything you're describing is existing issues.

https://github.com/llvm/llvm-project/pull/132147