[llvm] Port CodeGenPrepare to new pass manager (and BasicBlockSectionsProfil… (PR #75380)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > It's progress although the ProfileSummaryInfo hack is unfortunate
> 
> I was able to remove the ProfileSmmaryInfo hack in the last commit, and instead require ProfileSummary in the .ll regression tests via paperchalice's example.

Requiring manual specification of it isn't great, it just moves the workaround out of the sources and into the tests 

https://github.com/llvm/llvm-project/pull/75380