Add missing destructors found with -Wnon-virtual-dtor.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169303 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/Format.cpp

@@ -686,6 +686,9 @@ public:
         StructuralError(false) {
   }
 
+  virtual ~Formatter() {
+  }
+
   tooling::Replacements format() {
     UnwrappedLineParser Parser(Lex, SourceMgr, *this);
     StructuralError = Parser.parse();

lib/Format/UnwrappedLineParser.h

@@ -71,6 +71,8 @@ struct UnwrappedLine {
 
 class UnwrappedLineConsumer {
 public:
+  virtual ~UnwrappedLineConsumer() {
+  }
   virtual void formatUnwrappedLine(const UnwrappedLine &Line) = 0;
 };