Revert "Add macro C10_AS_INTARRAYREF_SLOW (#90675)"
This reverts commit 8090cb5386dccf4cf341aea585c793dfbb6c6002.
Reverted https://github.com/pytorch/pytorch/pull/90675 on behalf of https://github.com/osalpekar due to broke internal acc_tensor implementation in training_platform contbuild. See [D42052101](https://www.internalfb.com/diff/D42052101) for details.
