[llvm] [Inliner] Put inline history into IR as !inline_history metadata (PR #190876)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

Hey @aeubanks,

I believe this is the latest attempt at this work, and it has not been reverted, correct?

I'm just wanted to let you know that some NVIDIA folks are still having trouble with this, see comments on an earlier attempt ([here](https://github.com/llvm/llvm-project/pull/190700#issuecomment-4214241718) and [here](https://github.com/llvm/llvm-project/pull/190700#issuecomment-4234969482)).

https://github.com/llvm/llvm-project/pull/190876