Summary:
CFG generation is expected to fail in this case, but it should not crash.

Also added a test that reproduces the crash.

Reviewers: klimek

Subscribers: cfe-commits

Patch by Martin Boehme!

Differential Revision: http://reviews.llvm.org/D21895


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274834 91177308-0d34-0410-b5e6-96231b3b80d8