[JIT] register list prim ops cleanup (#35768)
Summary:
This is a follow up from https://github.com/pytorch/pytorch/pull/34520, which removed specialized list ops. This removes templating from list ops.
it also has one minor other change, which is to move `aten::len(t[]) -> int` to `aten::len(Any[]) -> int` so that heterogenous tuples can be called with `len()`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35768
Differential Revision: D20772943
Pulled By: eellison
fbshipit-source-id: bc36a00920bc94ca8c5aa9eb7d5d7a640388ffbb
