Force an unknown target for the default case to make it work.
Force an unknown target for the default case to make it work.

Summary:
This test was failing if LLVM_DEFAULT_TARGET_TRIPLE=x86_64-scei-ps4 due to
its behavior for exceptions.
Force an --unknown triple for the default case.

Reviewers: echristo, chandlerc

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D7422

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@228337 91177308-0d34-0410-b5e6-96231b3b80d8

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