[LLE] Add missed LoopSimplify dependence

The code assumed that we always had a preheader without making the pass
dependent on LoopSimplify.

Thanks to Mattias Eriksson V for reporting this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263173 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed