Add missing TORCH_API annotation (#36391)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36391
Without it I get
```
ImportError: /data/users/ezyang/pytorch-tmp/torch/lib/libtorch_python.so: undefined symbol: _ZN5torch3jit18checkDoubleInRangeEd
```
when I build with DEBUG=1
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D20964292
Pulled By: ezyang
fbshipit-source-id: b2569f5813c6490de51372e70029648a36891e7a
