Revert D23752058: [pytorch][PR] Don't split oversize cached blocks
Test Plan: revert-hammer
Differential Revision:
D23752058 (https://github.com/pytorch/pytorch/commit/67dcd62310aaadb396a08bea10581c02344d685e)
Original commit changeset: ccb7c13e3cf8
fbshipit-source-id: 12ae9702135ea510e9714ed97fb75ca3b9f97c27
