Initialize view_replay_enabled_ in the AutogradState ctor (#100822)
Cruise uses [clang static analyzer](https://clang-analyzer.llvm.org/) internally.
In the v2.0.0 release of PyTorch it found this problem
```
In file included from external/pytorch/aten/src/ATen/ATen.h:7:
In file included from external/pytorch/aten/src/ATen/Context.h:3:
In file included from external/pytorch/aten/src/ATen/CPUGeneratorImpl.h:3:
In file included from external/pytorch/aten/src/ATen/core/Generator.h:22:
In file included from external/pytorch/c10/core/GeneratorImpl.h:8:
In file included from external/pytorch/c10/core/TensorImpl.h:6:
external/pytorch/c10/core/InferenceMode.h:58:5: warning: Passed-by-value struct argument contains uninitialized data (e.g., field: 'view_replay_enabled_')
AutogradState::set_tls_state(AutogradState(
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
```
In other words, the value of `view_replay_enabled_` could be initialized which may lead to subtle bugs later on.
This PR addresses the warning by explicitly initializing it to `false`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100822
Approved by: https://github.com/Skylion007
