Summary: Patch by Sam McCall!

Reviewers: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D25162

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283332 91177308-0d34-0410-b5e6-96231b3b80d8