llvm compilation: added global code compilation, added global return support, added function index node compilation
llvm compilation: added global code compilation, added global return support, added function index node compilation

WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc,WheretIB/nullc