Summary:
Pull Request resolved: #33536

Simple fix, merge the identical string literals that were being inlined into every wrapper for ops that don't support named tensors. E.g.
```
Tensor all(const Tensor & self, int64_t dim, bool keepdim) {
    if (self.has_names()) {
        AT_ERROR(
            "all is not yet supported with named tensors. Please drop names via "
            "`tensor = tensor.rename(None)`, call the op with an unnamed tensor, "
            "and set names on the result of the operation.");
    }
    const OptionalDeviceGuard device_guard(device_of(self));
    return at::native::all(self, dim, keepdim);
}
```
becomes
```
Tensor all(const Tensor & self, int64_t dim, bool keepdim) {
    if (self.has_names()) {
        AT_ERROR("all", named_tensors_unsupported_error);
    }
    const OptionalDeviceGuard device_guard(device_of(self));
    return at::native::all(self, dim, keepdim);
}
```

Also updated the generated file comments to include the source template names, e.g.
```
// generated by aten/src/ATen/gen.py from TypeDefault.cpp
```

Test Plan: Imported from OSS

Differential Revision: D19993407

Pulled By: bhosmer

fbshipit-source-id: 88395a649e6ba53191332344123555c217c5eb40