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

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

It is unclear how this change leads to the effects that you describe. This change should essentially be NFC. You would only get impacts like you describe if suddenly intrinsics are getting lowered to loops or something rather than libcalls.

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