function getHighWord( x ) {
	return addon( x );
}
Returns an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.

@private
@param {number} x - input value
@returns {uinteger32} higher order word

@example
var w = getHighWord( 3.14e201 ); // => 01101001110001001000001011000011
// returns 1774486211