[PyTorch Edge] Backport function for defaults args with out args, flag on (#63651)
Summary:
1. Enable support for operators with default args and out args. For `torch.add(x, h, out=x)`, the number of specified arguments will be 3 instead of 4.
2. Bump bytecode version from 6 to 7
3. Implement backport_v7_to_v6 function. Also slightly refactor the local_thread to allow re-emit operators.
4. unittest to cover backport function
5. Update expect result from 4 to 3 in unit test DefaultArgsWithOutArg to cover the number of specified arguments.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63651
ghstack-source-id: 138539912
Test Plan:
```
caffe2/test/cpp/jit:jit - LiteInterpreterTest.DefaultArgsWithOutArg
caffe2/test/cpp/jit:jit - LiteInterpreterTest.DefaultArgsPinvWithOutArg
caffe2/test/cpp/jit:jit - LiteInterpreterTest.BackPortByteCodeModelAllVersions
```
Reviewed By: raziel, tugsbayasgalan
Differential Revision: D30454080
fbshipit-source-id: 357c50b96682430675142d20d688d1f64e1de307
