Revert "Symintify getitem and add the required helper functions (#86207)"
This reverts commit fd5085c445c3f1a4c90e55154cf26fe30f52a0ab.
Reverted https://github.com/pytorch/pytorch/pull/86207 on behalf of https://github.com/seemethere due to Fails internal tests, see: https://www.internalfb.com/intern/sandcastle/job/22517998926071860/insights
