Revert "[LoopUnroll] Properly update loop-info when cloning prologues and epilogues."

This reverts commit r280901.

This caused a bunch of failures, reverting it until I investigate them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280905 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed