Revert D27487549: [TensorExpr] Add `CodeGen::call_raw` method.
Test Plan: revert-hammer
Differential Revision:
D27487549 (https://github.com/pytorch/pytorch/commit/c9ab384af7f6b0e2dc2a0d4732be46da2a320f7a)
Original commit changeset: d8f3d92262cd
fbshipit-source-id: ea8e71dbe2d632bc0fb557362c8bd899eb6aa83a
