[llvm] [Transforms][IPO] Add remarks for ArgumentPromotion and DeadArgumentE… (PR #105740)

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yonghong-song wrote:

> > > Also add a test case?
> > 
> > 
> > Looks like you are okay with the format? I will add a test case in the next revision.
> 
> Adding a case will help get a better feel of the format too.

@david-xl I just added two remark tests corresponding to optimization passes. Please take a look.

https://github.com/llvm/llvm-project/pull/105740