r310940 exposed reverse-unreachable code to some optimizers,
which caused some of the code in this test to be sunk, changing
the input to the pass and breaking the exptectations.
Since that change is irrelevant to this particular test, this change
just adds an exit node to work around the problem; the
test should really be more robust (or be an MIR test?) but this preserves
the existing test intent.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310981 91177308-0d34-0410-b5e6-96231b3b80d8
Derek Schuff
9689681e1b