Avoid snowballing errors into additional warnings.  To do better, we'd
need an error term for the CFG.  I suspect we'll always have to cope
with getCFG returning 0, though, I'd love to see even that possibility
removed.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@93411 91177308-0d34-0410-b5e6-96231b3b80d8
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