[llvm] [ML Inliner] Fix inconsistancy between CallGraph and FunctionLevels (PR #122830)

[Peter Rong via llvm-commits]

DataCorrupted wrote:

I put the task as low priority and after three month the file that used to trigger the error compiles fine now. 

Maybe it's because we moved from LLVM 17 -> 19, maybe the file structure changed. Either way I'm closing this and won't reopen until I can spot similar bugs again.

https://github.com/llvm/llvm-project/pull/122830