DeltaAlgorithm: Add a virtual destructor and home.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90957 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/DeltaAlgorithm.cpp b/lib/Support/DeltaAlgorithm.cpp
index f85ca30..d176548 100644
--- a/lib/Support/DeltaAlgorithm.cpp
+++ b/lib/Support/DeltaAlgorithm.cpp
@@ -11,6 +11,9 @@
 #include <iterator>
 using namespace llvm;
 
+DeltaAlgorithm::~DeltaAlgorithm() {
+}
+
 bool DeltaAlgorithm::GetTestResult(const changeset_ty &Changes) {
   if (FailedTestsCache.count(Changes))
     return false;