Adds 'override' to overriding methods. NFC.
These were uncoveredby my yet undelivered patch.

llvm-svn: 218774
diff --git a/clang/unittests/ASTMatchers/ASTMatchersTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersTest.cpp
index f16e5a0..4eb4c0d 100644
--- a/clang/unittests/ASTMatchers/ASTMatchersTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersTest.cpp
@@ -725,7 +725,7 @@
     EXPECT_EQ("", Name);
   }
 
-  virtual bool run(const BoundNodes *Nodes) {
+  virtual bool run(const BoundNodes *Nodes) override {
     const BoundNodes::IDToNodeMap &M = Nodes->getMap();
     if (Nodes->getNodeAs<T>(Id)) {
       ++Count;
@@ -747,7 +747,7 @@
     return false;
   }
 
-  virtual bool run(const BoundNodes *Nodes, ASTContext *Context) {
+  virtual bool run(const BoundNodes *Nodes, ASTContext *Context) override {
     return run(Nodes);
   }