Fix typo in comment.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212404 91177308-0d34-0410-b5e6-96231b3b80d8
Update for llvm api change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212408 91177308-0d34-0410-b5e6-96231b3b80d8