Fix code gen bug on arm and mips; SeqStringSetChar overwrites a register; Add better default PrintD…

src/hydrogen-instructions.h

 // 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 1232 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(HValue);
 };
 
 
 class HInstruction: public HValue {
  public:
   HInstruction* next() const { return next_; }
   HInstruction* previous() const { return previous_; }
 
   virtual void PrintTo(StringStream* stream);
-  virtual void PrintDataTo(StringStream* stream) { }
+  virtual void PrintDataTo(StringStream* stream);
 
   bool IsLinked() const { return block() != NULL; }
   void Unlink();
   void InsertBefore(HInstruction* next);
   void InsertAfter(HInstruction* previous);
 
   // The position is a write-once variable.
   int position() const { return position_; }
   bool has_position() const { return position_ != RelocInfo::kNoPosition; }
   void set_position(int position) {
@@ skipping 5185 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_