Change LastIndexJavaScriptImplementation()
Change LastIndexJavaScriptImplementation()

Change LastIndexJavaScriptImplementation() to match the spec pseudo code
of http://www.ecma-international.org/ecma-262/5.1/#sec-15.5.4.8

ImagineLearning/Jint,ImagineLearning/Jint,ayende/jint,sebastienros/jint,Nogrod/jint,hnafar/jint,santiagoaguiar/jint,mgentile/jint,hnafar/jint,npenin/jint,santiagoaguiar/jint,reidyd/jint,Nogrod/jint,fvaneijk/jint,flts/jint,mgentile/jint,honestegg/jint,sanyaade-iot/jint,npenin/jint,Notulp/jint,flts/jint,Notulp/jint,sanyaade-iot/jint,tylerjwatson/jint,reidyd/jint,fvaneijk/jint,ayende/jint,chaquotay/jint,djMax/jint,honestegg/jint,chaquotay/jint,djMax/jint,sebastienros/jint