[DebugInfo] Subprograms should belong to a CU.

Start fixing tests accordingly. There are still
about 35 failures before we can enable this check
in the IR verifier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264990 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed