hotfix: revert torch.library register #709
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We observe performance degradation for small operations in flashinfer v0.2 because of the overhead of
torch.library.custom_opintroduced in #554.This PR disables torch custom operator registrations first, we can add them back with lightweight registration later: https://github.com/vllm-project/vllm/blob/36e76700453924c8d421db99af70a88a1df835cd/vllm/utils.py#L1660-L1674
cc @zhyncs @abcdabcd987 @youkaichao