[llvm] PlaceSafepoints: Fix using default constructed TargetLibraryInfo (PR #92411)

[Philip Reames via llvm-commits]

https://github.com/preames approved this pull request.

LGTM so that you can make forward progress.

We really should just delete PlaceSafepoints.  To my knowledge, no one is using this.

https://github.com/llvm/llvm-project/pull/92411