Thread local Stopgap

I made the stopgap solution thread local. It's still expensive.

   ~VMObjectArray() {
#ifdef GC_STOPGAP
        if (deferring) {
            for (int i = 0; i < _size; i++) {
                defer.push(_array[i]);
            }
            delete[] _array;
        } else {
            deferring = true;
            for (int i = 0; i < _size; i++) {
                defer.push(_array[i]);
            }
            delete[] _array;
            while (!defer.empty()) {
                defer.pop();
            }
            deferring = false;
        }
#else
        delete[] _array;
#endif
    }