Revert D24100389: Revert D24072697: [te] Get llvm codegen to compile with llvm9 and llvm-fb
Test Plan: revert-hammer
Differential Revision:
D24100389
Original commit changeset: b32c5163e4fb
fbshipit-source-id: 9ce7bfbcf411c0584e5d535ee107fb5a135ee6e6
