Revert D25172740: [pytorch][PR] [CUDA graphs] Make CUDAGeneratorImpl capturable
Test Plan: revert-hammer
Differential Revision:
D25172740 (https://github.com/pytorch/pytorch/commit/2200e722930c7e4bb8bb9891b943b85d732f5043)
Original commit changeset: c4568605755c
fbshipit-source-id: 3ebc845856096f5707897bfabaf718c8e13e86f0
