Verifier: Mark orphaned DICompileUnits as a debug info failure.
This is a follow-up to r268778 that adds a couple of missing cases,
most notably orphaned compile units.

rdar://problem/28193346

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281508 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 50aa9109c611755c1f00ed958292b67dc95c358e)
2 files changed