[Bitcode] Add compatibility test for the 3.9 release

Fork off compatibility.ll for the 3.9 release. The *.bc file in this
commit was produced using a Release build of the release_39 branch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281059 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed