[llvm] [SDAG] Only apply sincos/frexp stack slot folding to IR pointers (PR #115346)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

> > Any thoughts on this? I think it'd be good to find a solution here 🙂
> 
> Until we find the proper solution, maybe we should consider rolling this back, or doing the conservative suggestion 3) above?

I've created a PR for the conservative check here: https://github.com/llvm/llvm-project/pull/115906

https://github.com/llvm/llvm-project/pull/115346