Add Runtime Constant-Folding function of AOTInductor for AOTInductorModels used internally. (#119823)
Summary:
1. Make sure folded constants generated internally doesn't get exposed.
2. Add runConstantFolding and related API calls
Test Plan:
```buck2 run mode/opt-split-dwarf -c fbcode.nvcc_arch=v100,a100 caffe2/caffe2/fb/predictor/tests_gpu:pytorch_predictor_container_gpu_test -- --gtest_filter=*PyTorchPredictorContainerTest.LoadAOTInductorModel*
```
The test triggers the added predictor tests `test_aot_inductor_merge_net_file_*.predictor_20240206`,
which would trigger runConstantFolding from predictor's module loading.
Reviewed By: SherlockNoMad
Differential Revision: D53718139
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119823
Approved by: https://github.com/chenyang78
