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

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

@example
var w = getLowWord( 3.14e201 ); // => 10010011110010110101100010000010
// returns 2479577218