[llvm] Reapply "[llvm-objcopy] Strip header from DXContainer's ILDB part during `--dump-section`" (PR #200906)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

LGTM.

It frustrates me how many differences there are in `od` output between different platforms. It's probably time we wrote an llvm tool to do the same job in a platform-independent manner...

https://github.com/llvm/llvm-project/pull/200906