Small performance optimization to ResolveCallable
Small performance optimization to ResolveCallable

somjit2514/basic,designermonkey/Slim,Sam-Burns/Slim,samsonasik/Slim,opengeek/Slim,mnapoli/Slim,slimphp/Slim,jaapverloop/Slim,iinux/Slim,AndrewCarterUK/Slim,JoeBengalen/Slim,RealSelf/Slim,juliangut/Slim,iinux/Slim,dopesong/Slim,akrabat/Slim,foxyantho/Slim,iinux/Slim,feryardiant/slim