Fixed size arrays (#23695)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23695
Fix JIT schema inference for fixed sized arrays like `int[3]` and move corresponding ops to the c10 dispatcher.
ghstack-source-id: 90222271
Test Plan: waitforsandcastle
Differential Revision: D16611697
fbshipit-source-id: b20a479ffcd8fe8421b11bb259802745923e3b0d
