Fix PR20773 which I introduced with a silly edit mistake in r216531.
Trivial fix, and I've made the gentoo tests more representative. With
the changes, they would have caught this failure.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@216572 91177308-0d34-0410-b5e6-96231b3b80d8