function maxabsf( x, y ) {
	return addon( x, y );
}
Returns the maximum absolute single-precision floating-point number.

@private
@param {number} x - first number
@param {number} y - second number
@returns {number} maximum absolute value

@example
var v = maxabsf( -4.0, 3.0 );
// returns 4.0

@example
var v = maxabsf( 0.0, -0.0 );
// returns +0.0

@example
var v = maxabsf( 3.14, NaN );
// returns NaN

@example
var v = maxabsf( NaN, 5.0 );
// returns NaN