Revert D31445798: [Static Runtime] Cleanup LLVMCodeGen memory after code gen completes
Test Plan: revert-hammer
Differential Revision:
D31445798 (https://github.com/pytorch/pytorch/commit/40dd2711b6e31518abce4bffbae0f63441b42069)
Original commit changeset: c860d36456b2
fbshipit-source-id: 64d900cad87113e6b871aedd6669e771a7ede5cc
