[llvm] [llvm-readobj] Fixes malformed json on JSON printed corefiles (PR #92835)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Code looks good, barring a doc issue. Please also update the PR description to match the current change, in particular noting that the LLVM output has been structurally changed to make it work for JSON output too.

https://github.com/llvm/llvm-project/pull/92835