[DWARFLinker] Update stmt-seq-macho.test to use update_test_body.py (#133363)

In this change we update DWARFLinker test
`llvm/test/tools/dsymutil/ARM/stmt-seq-macho.test` to be self-contained
and easy to regenerate via `update_test_body.py`. As relating to [this
comment](https://github.com/llvm/llvm-project/pull/132875/files#r2012471834)
- this would be approach nr.2

Updating the test can be done via:
```
PATH=/path/to/llvm/bin:$PATH llvm/utils/update_test_body.py llvm/test/tools/dsymutil/ARM/stmt-seq-macho.test
```

Author: alx32