function log2Uint32( x ) {
	return addon( x );
}
Computes an integer binary logarithm (base two).

@private
@param {uinteger32} x - input value
@returns {uinteger32} integer binary logarithm

@example
var out = log2Uint32( 4 );
// returns 2

@example
var out = log2Uint32( 8 );
// returns 3

@example
var out = log2Uint32( 9 );
// returns 3