[llvm] [NewPM] Don't preserve BlockFrequencyInfo in FunctionToLoopPassAdaptor (PR #157888)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

paging back in new pass manager into my brain... I'm remembering the compile-time reason loop passes must preserve function analyses (search "quadratic" in https://llvm.org/docs/NewPassManager.html#using-analyses). but this is doing something different, it's not preserving after all the loop passes run in the function -> loop adaptor. I think that should be fine compile-time-wise, it's equivalent to a function pass using and not preserving BFI

I think this makes sense to me, does anyone else have any objections?

https://github.com/llvm/llvm-project/pull/157888