[lldb] Delete dead, infinitely-recursive code (NFC)

tools/debugserver/source/MacOSX/CFData.h

 class CFData : public CFReleaser<CFDataRef>
 {
 public:
     //------------------------------------------------------------------
     // Constructors and Destructors
     //------------------------------------------------------------------
     CFData(CFDataRef data = NULL);
     CFData(const CFData& rhs);
-    CFData& operator=(const CFData& rhs);
     virtual ~CFData();
 
         CFDataRef Serialize(CFPropertyListRef plist, CFPropertyListFormat format);
         const uint8_t* GetBytePtr () const;
         CFIndex GetLength () const;
 protected:
     //------------------------------------------------------------------
     // Classes that inherit from CFData can see and modify these
     //------------------------------------------------------------------
 };
 
 #endif // #ifndef __CFData_h__

tools/debugserver/source/MacOSX/CFData.cpp

 //----------------------------------------------------------------------
 CFData::CFData(const CFData& rhs) :
     CFReleaser<CFDataRef>(rhs)
 {
 
 }
 
 //----------------------------------------------------------------------
-// CFData copy constructor
-//----------------------------------------------------------------------
-CFData&
-CFData::operator=(const CFData& rhs)
-
-{
-    *this = rhs;
-    return *this;
-}
-
-//----------------------------------------------------------------------
 // Destructor
 //----------------------------------------------------------------------
 CFData::~CFData()
 {
 }
 
 
 CFIndex