function asinf( x ) {
	return addon( x );
}
Computes the arcsine of a single-precision floating-point number.

@private
@param {number} x - input value
@returns {number} arcsine (in radians)

@example
var v = asinf( 0.0 );
// returns 0.0

@example
var v = asinf( 3.14/4.0 );
// returns ~0.903

@example
var v = asinf( -3.14/6.0 );
// returns ~-0.551

@example
var v = asinf( NaN );
// returns NaN