Fix a test file option from -emit-llvm -o to -emit-llvm-only.

As requested by Rafael Espindola here: http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20131021/091556.html


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193296 91177308-0d34-0410-b5e6-96231b3b80d8