[C++11] Add 'override' keywords and remove 'virtual'. Additionally add 'final' and leave 'virtual' on some methods that are marked virtual without overriding anything and have no obvious overrides themselves.

llvm-svn: 207511
diff --git a/llvm/lib/Target/CppBackend/CPPBackend.cpp b/llvm/lib/Target/CppBackend/CPPBackend.cpp
index f16547a..fbb34ed 100644
--- a/llvm/lib/Target/CppBackend/CPPBackend.cpp
+++ b/llvm/lib/Target/CppBackend/CPPBackend.cpp
@@ -108,9 +108,9 @@
     explicit CppWriter(formatted_raw_ostream &o) :
       ModulePass(ID), Out(o), uniqueNum(0), is_inline(false), indent_level(0){}
 
-    virtual const char *getPassName() const { return "C++ backend"; }
+    const char *getPassName() const override { return "C++ backend"; }
 
-    bool runOnModule(Module &M);
+    bool runOnModule(Module &M) override;
 
     void printProgram(const std::string& fname, const std::string& modName );
     void printModule(const std::string& fname, const std::string& modName );