Hopefully unbreak bots which are seeing an assert in this test. Temporary, real
fix to come once I've tracked down the problem (which is pre-existing and not
related to the change which introduced this test).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191279 91177308-0d34-0410-b5e6-96231b3b80d8