Revert D24072697: [te] Get llvm codegen to compile with llvm9 and llvm-fb
Test Plan: revert-hammer
Differential Revision:
D24072697 (https://github.com/pytorch/pytorch/commit/e3d2defdc862c4b28858c2a920532b5baab2e963)
Original commit changeset: 7f56b9f3cbe5
fbshipit-source-id: b32c5163e4fb6df99447f95fdb82674e5ae62f22
