[llvm] [ArgPromotion] Handle pointer arguments of recursive calls (PR #78735)

[Vedant Paranjape via llvm-commits]

vedantparanjape-amd wrote:

@arsenm @jdoerfert I have addressed the comment, but I am stuck at one thing. The testcase: Transforms/ArgumentPromotion/pr42028-recursion.ll

```
A -> B -> C
     ↑____|
```

It has a SCC like this.


https://github.com/llvm/llvm-project/pull/78735