Before `bc713f6a004723d1325bc16e1efc32d0ac82f939` landed, the analyzer
crashed on this reduced example.
It seems important to have bot `ctu` and `-analyzer-opt-analyze-headers`
enabled in the example.
This test file ensures that no regression happens in the future in this regard.
Reviewed By: martong, NoQ
Differential Revision: https://reviews.llvm.org/D96586
Balazs Benics