This test case is causing all PPC and SystemZ bots to remain red.

This test case is causing all PPC and SystemZ bots to remain red.

Notifying the author via Diffusion did not yield any answer. Therefore, I'm
adding the missing triple. I have no idea if this is the intended triple, but
it seems to fit the bill and should turn the bots back to green.
If the intended triple is a different one, please feel free to change it but I
need make this change to turn the bots back to green now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@308985 91177308-0d34-0410-b5e6-96231b3b80d8