Replace OVERRIDE->override and FINAL->final since we now require C++11.

src/compiler/control-equivalence.h

Index: src/compiler/control-equivalence.h
diff --git a/src/compiler/control-equivalence.h b/src/compiler/control-equivalence.h
index 4130c88002efd524e7a3de90ad1f0e281bc14e26..478e48b46d7e542680186458aca2bdbed255ae85 100644
--- a/src/compiler/control-equivalence.h
+++ b/src/compiler/control-equivalence.h
@@ -28,7 +28,7 @@ namespace compiler {
 // control regions in linear time" by Johnson, Pearson & Pingali (PLDI94) which
 // also contains proofs for the aforementioned equivalence. References to line
 // numbers in the algorithm from figure 4 have been added [line:x].
-class ControlEquivalence FINAL : public ZoneObject {
+class ControlEquivalence final : public ZoneObject {
  public:
   ControlEquivalence(Zone* zone, Graph* graph)
       : zone_(zone),