Fix the false generated_comment (#17563)
Summary:
The generated_comments are wrong to below generated files:
```bash
./torch/csrc/autograd/generated/VariableType_0.cpp:3:// generated from tools/autograd/templates/VariableType_0.cpp
./torch/csrc/autograd/generated/VariableType_1.cpp:3:// generated from tools/autograd/templates/VariableType_1.cpp
./torch/csrc/autograd/generated/VariableType_2.cpp:3:// generated from tools/autograd/templates/VariableType_2.cpp
./torch/csrc/autograd/generated/VariableType_3.cpp:3:// generated from tools/autograd/templates/VariableType_3.cpp
./torch/csrc/autograd/generated/VariableType_4.cpp:3:// generated from tools/autograd/templates/VariableType_4.cpp
./torch/csrc/autograd/generated/VariableTypeEverything.cpp:3:// generated from tools/autograd/templates/VariableTypeEverything.cpp
./torch/csrc/jit/generated/register_aten_ops_0.cpp:23:// generated from tools/autograd/templates/register_aten_ops_0.cpp
./torch/csrc/jit/generated/register_aten_ops_1.cpp:23:// generated from tools/autograd/templates/register_aten_ops_1.cpp
./torch/csrc/jit/generated/register_aten_ops_2.cpp:23:// generated from tools/autograd/templates/register_aten_ops_2.cpp
```
These generated files were split to speed the compile, however, the template files are not.
After this fix, the comments will look like below:
```bash
./torch/csrc/autograd/generated/VariableType_0.cpp:3:// generated from tools/autograd/templates/VariableType.cpp
./torch/csrc/autograd/generated/VariableType_1.cpp:3:// generated from tools/autograd/templates/VariableType.cpp
......
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17563
Differential Revision: D14260992
Pulled By: soumith
fbshipit-source-id: 038181367fa43bee87837e4170704ddff7f4d6f2
