Summary:
Otherwise we might end up with some empty basic blocks or
single-entry-single-exit basic blocks.
This fixes PR32085
Reviewers: chandlerc, danielcdh
Subscribers: mehdi_amini, RKSimon, llvm-commits
Differential Revision: https://reviews.llvm.org/D30468
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301395 91177308-0d34-0410-b5e6-96231b3b80d8
