Use V8_FINAL and V8_OVERRIDE in various places, fixing bugs revealed by them.

src/x64/lithium-gap-resolver-x64.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 20 matching lines @@
 #include "v8.h"
 
 #include "lithium.h"
 
 namespace v8 {
 namespace internal {
 
 class LCodeGen;
 class LGapResolver;
 
-class LGapResolver FINAL BASE_EMBEDDED {
+class LGapResolver V8_FINAL BASE_EMBEDDED {
  public:
   explicit LGapResolver(LCodeGen* owner);
 
   // Resolve a set of parallel moves, emitting assembler instructions.
   void Resolve(LParallelMove* parallel_move);
 
  private:
   // Build the initial list of moves.
   void BuildInitialMoveList(LParallelMove* parallel_move);
 
@@ skipping 13 matching lines @@
 
   LCodeGen* cgen_;
 
   // List of moves not yet resolved.
   ZoneList<LMoveOperands> moves_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_LITHIUM_GAP_RESOLVER_X64_H_