[clang] [llvm] Revert "CodeGen: Add LibcallLoweringInfo analysis pass (#168622)" (PR #171452)

[Aiden Grossman via cfe-commits]

https://github.com/boomanaiden154 approved this pull request.

Reverting for now seems fine to me. It wouldn't be a bad idea to wait for Matt to weigh in though.

My guess is the fix would be pretty simple, but reverting until we figure out what that is seems okay.

https://github.com/llvm/llvm-project/pull/171452