[llvm] Minor post-commit review changes for #130988 (NFC) (PR #156895)

[Frederik Harwath via llvm-commits]

frederik-h wrote:

I'll leave the functional change for the problem in the skipFunction/optnone handling in expand-fp observed by @mikaelholmen and @bjope for a separate PR. 

https://github.com/llvm/llvm-project/pull/156895