[llvm] [PseudoProbe] Add PseudoProbeDescUpdatePass (PR #99839)

[via llvm-commits]

WenleiHe wrote:

> I think 2 is necessary and better to fix 1 since lost debug info is something always happened.

Why is this something that always happened? This is about an entire function missing debug info. Evidently, we haven't run into any such cases in any of our code base. Fixing #1 is handling the root cause, while fixing #2 is just hiding the underlying issue. 

> Will you fix llvm-profgen issue?

We will get to that, feel free to send a patch too. But fixing root cause (#1) should be prioritized over this.  

https://github.com/llvm/llvm-project/pull/99839