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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203220 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/DFAPacketizer.cpp

@@ -108,7 +108,7 @@ public:
   DefaultVLIWScheduler(MachineFunction &MF, MachineLoopInfo &MLI,
                    MachineDominatorTree &MDT, bool IsPostRA);
   // Schedule - Actual scheduling work.
-  void schedule();
+  void schedule() override;
 };
 }