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

[via llvm-commits]

alx32 wrote:

https://github.com/llvm/llvm-project/pull/137017 should be the fix for the failing tests. 

We should probably also modify `obj2yaml` to either:
- Make 'IsLittleEndian: true' non-optional (This will probably require lots of changes in existing tests and probably break external users)
- Add an optional parameter to `obj2yaml` => `--always-include-endianness`

https://github.com/llvm/llvm-project/pull/133363