Adds `c_shim_aten.{h/cpp}` and use this for `fill_`
This is the generated `c_shim_aten.cpp` for reference
```cpp
// WARNING: THIS FILE IS AUTOGENERATED BY torchgen. DO NOT MODIFY BY HAND.
// See 7e86a7c015/torchgen/gen.py (L2424-L2436) for details
// This file corresponds to the aten_shimified_ops list in torchgen/aoti/fallback_ops.py
#include <torch/csrc/inductor/aoti_torch/generated/c_shim_aten.h>
#include <torch/csrc/inductor/aoti_torch/utils.h>
#ifndef AT_PER_OPERATOR_HEADERS
#include <ATen/Functions.h>
#include <ATen/CompositeExplicitAutogradFunctions.h>
#include <ATen/CompositeExplicitAutogradNonFunctionalFunctions.h>
#include <ATen/CompositeImplicitAutogradFunctions.h>
#else
#include <ATen/ops/fill.h>
#endif // AT_PER_OPERATOR_HEADERS
using namespace torch::aot_inductor;
AOTITorchError aoti_torch_aten_fill__Scalar(AtenTensorHandle self, double value) {
AOTI_TORCH_CONVERT_EXCEPTION_TO_ERROR_CODE({
at::fill_(
*tensor_handle_to_tensor_pointer(self), value
);
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/158974
Approved by: https://github.com/albanD, https://github.com/janeyx99
e65ab9a868