Cache function calls

[soywiz]

Instead of:

var func = function() {
    // code
    getFuncAddress(address)(...)
}

var func = (function() {
    var func1= null;
    var func2= null;
    return function() {
        // code
        if (func1 == null) func1 = getFuncAddress(address);
        func1();
    };
})()