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

[Nick Anderson via llvm-commits]

nickleus27 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.

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