Revert D31445797: [nnc] Added a cache to use singleton instances of PytorchLLVMJIT for every triple,cpu,attrs combination
Test Plan: revert-hammer
Differential Revision:
D31445797 (https://github.com/pytorch/pytorch/commit/7e5ef5e5172ce7d42022371cfef194e378ad77ac)
Original commit changeset: 4e1450100928
fbshipit-source-id: fc13b34dbb66c7a22816eb46cf6d98ae9f332d39
