Method GetHighHalf

src/cryptopp/integer.cpp:404–404

	word GetWhole() const {return m_whole;}
	hword GetLowHalf() const {return hword(m_whole);}
	hword GetHighHalf() const {return hword(m_whole>>(WORD_BITS/2));}
	hword GetHighHalfAsBorrow() const {return 0-hword(m_whole>>(WORD_BITS/2));}

private: