Summary:
This patch fixes a regression after https://reviews.llvm.org/rL305665,
which updates the structure of the `lines` variable.

Reviewers: djasper

Reviewed By: djasper

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D37011

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@311456 91177308-0d34-0410-b5e6-96231b3b80d8