DeltaAlgorithm: Add a virtual destructor and home.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90957 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/DeltaAlgorithm.h

@@ -78,6 +78,8 @@ protected:
   virtual bool ExecuteOneTest(const changeset_ty &S) = 0;
 
 public:
+  virtual ~DeltaAlgorithm();
+
   /// Run - Minimize the set \arg Changes by executing \see ExecuteOneTest() on
   /// subsets of changes and returning the smallest set which still satisfies
   /// the test predicate.

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;