Fix a (legacy) PassManager crash that occurs when a ModulePass
indirectly requires a function analysis.

This bug was reported by Jason Kim. He included a test case here:
http://reviews.llvm.org/D3312

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205753 91177308-0d34-0410-b5e6-96231b3b80d8