Map rawGet rawSet
Stack for VM
add Stack; disable builtin.gc;
work on VM::getField for map;
remove args argument on VM::run()
rename VM::run() to VM::call()
have CALL op invoke VM::call()
minor call stack prepare nFromTail
add prepareStackForCall VM
invoke prepareStackForCall from VM::call
add FAST_CALL to toggle call path; VM::call returns void; disable GC broken;