Revert "Specialize optional tensor inputs to graphs in the JIT (#18360)" (#18411)
Summary:
This reverts commit 7cc7ed1322405ba3c627b9c5661a330f92c4183d.
I think it's better to sort out the issues raised in #18407 firs. I'm sorry for not stopping it earlier.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18411
Differential Revision: D14594937
Pulled By: soumith
fbshipit-source-id: 3c90b7fa7694e2f59e55607acecde4a47af801ea
