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

Function analyses in LoopStandardAnalysisResults are marked as preserved
by the loop pass adaptor, because LoopAnalysisManagerFunctionProxy
manually invalidates most of them.

However the proxy doesn't invalidate BFI, since it is only preserved on
a "lossy" basis: see https://reviews.llvm.org/D86156 and
https://reviews.llvm.org/D110438.

So any changes to the CFG will result in BFI giving incorrect results,
which is fine for loop passes which deal with the lossiness.

But the loop pass adapator still marks it as preserved, which causes the
lossy result to leak out into function passes.

This causes incorrect results when viewed from e.g. LoopVectorizer,
where an innermost loop header may be reported to have a smaller
frequency than its successors.

This fixes this by dropping the call to preserve, and adds a test with
the -O1 pipeline which shows the effects whenever the CFG is changed and
UseBlockFrequencyInfo is set.

I've also dropped it for BranchProbabilityAnalysis too, but I couldn't
test for it since UseBranchProbabilityInfo always seems to be false?
This may be dead code.