[C++11] Add 'override' keyword to virtual methods that override their base class.

llvm-svn: 203378
diff --git a/llvm/lib/Target/X86/X86PadShortFunction.cpp b/llvm/lib/Target/X86/X86PadShortFunction.cpp
index 83e75ea..746d0d6 100644
--- a/llvm/lib/Target/X86/X86PadShortFunction.cpp
+++ b/llvm/lib/Target/X86/X86PadShortFunction.cpp
@@ -51,9 +51,9 @@
     PadShortFunc() : MachineFunctionPass(ID)
                    , Threshold(4), TM(0), TII(0) {}
 
-    virtual bool runOnMachineFunction(MachineFunction &MF);
+    bool runOnMachineFunction(MachineFunction &MF) override;
 
-    virtual const char *getPassName() const {
+    const char *getPassName() const override {
       return "X86 Atom pad short functions";
     }