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

src/ast.cc

 // Copyright 2012 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 840 matching lines @@
 bool RegExpCapture::IsAnchoredAtEnd() {
   return body()->IsAnchoredAtEnd();
 }
 
 
 // Convert regular expression trees to a simple sexp representation.
 // This representation should be different from the input grammar
 // in as many cases as possible, to make it more difficult for incorrect
 // parses to look as correct ones which is likely if the input and
 // output formats are alike.
-class RegExpUnparser: public RegExpVisitor {
+class RegExpUnparser V8_FINAL : public RegExpVisitor {
  public:
   explicit RegExpUnparser(Zone* zone);
   void VisitCharacterRange(CharacterRange that);
   SmartArrayPointer<const char> ToString() { return stream_.ToCString(); }
-#define MAKE_CASE(Name) virtual void* Visit##Name(RegExp##Name*, void* data);
+#define MAKE_CASE(Name) virtual void* Visit##Name(RegExp##Name*,          \
+                                                  void* data) V8_OVERRIDE;
   FOR_EACH_REG_EXP_TREE_TYPE(MAKE_CASE)
 #undef MAKE_CASE
  private:
   StringStream* stream() { return &stream_; }
   HeapStringAllocator alloc_;
   StringStream stream_;
   Zone* zone_;
 };
 
 
@@ skipping 313 matching lines @@
     OS::SNPrintF(buffer, "%d", Smi::cast(*value_)->value());
     str = arr;
   } else {
     str = DoubleToCString(value_->Number(), buffer);
   }
   return factory->NewStringFromAscii(CStrVector(str));
 }
 
 
 } }  // namespace v8::internal