Adding missing anchor to DATDeltaAlgorithm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146025 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/DAGDeltaAlgorithm.cpp b/lib/Support/DAGDeltaAlgorithm.cpp
index 8145664..1e89c6a 100644
--- a/lib/Support/DAGDeltaAlgorithm.cpp
+++ b/lib/Support/DAGDeltaAlgorithm.cpp
@@ -350,6 +350,9 @@
   return Required;
 }
 
+void DAGDeltaAlgorithm::anchor() {
+}
+
 DAGDeltaAlgorithm::changeset_ty
 DAGDeltaAlgorithm::Run(const changeset_ty &Changes,
                        const std::vector<edge_ty> &Dependencies) {