[nnc][trivial] Refactor llvm_jit so the wrapper class doesn't depend on ifdefs (#51186)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51186
Just a bit of drive-by cleanup; the wrapper class should be the same
for all builds so let's not conditionally compile it for no reason.
ghstack-source-id: 120614088
Test Plan: buck build
Reviewed By: navahgar
Differential Revision: D26096205
fbshipit-source-id: 1e4cb682614fae0e889ba35fb1edb489fb99158e
