[llvm] [SystemZ][z/OS] yaml2obj for header and end records (PR #73859)

[Kai Nacke via llvm-commits]

https://github.com/redstar approved this pull request.

LGTM.
Only a default version of the END record is implemented. Currently, AMODE, record count, etc. cannot be specified; see [End of module record](https://www.ibm.com/docs/en/zos/3.1.0?topic=formats-end-module-record) for the possible fields of the END record. That can be easily added on top of this implementation.

https://github.com/llvm/llvm-project/pull/73859