[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. Sparc edition

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207502 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Sparc/SparcTargetMachine.cpp

@@ -77,8 +77,8 @@ public:
     return getTM<SparcTargetMachine>();
   }
 
-  virtual bool addInstSelector();
-  virtual bool addPreEmitPass();
+  bool addInstSelector() override;
+  bool addPreEmitPass() override;
 };
 } // namespace