[llvm] [InstCombine] Push freeze through non-recurrence PHIs (PR #157678)

[Cullen Rhodes via llvm-commits]

c-rhodes wrote:

> Probably if we want to push through freeze we need to integrate the recurrence and non-recurrence cases...

Do you mean perhaps doing this as part of #155638 or going even further and integrating `foldOpIntoPhi` / `foldFreezeIntoRecurrence`?

https://github.com/llvm/llvm-project/pull/157678