[llvm] [PassManager] Add pretty stack frames (PR #96078)

[Nikita Popov via llvm-commits]

nikic wrote:

> I would have liked to print the pipeline string instead of pass name (so we also get pass options), but the necessary information for that doesn't seem to be available.

I just realized that this *is* available via PI -> PIC, just currently not exposed in the API. I think I'll change this PR to make use of that.

https://github.com/llvm/llvm-project/pull/96078