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

[Paul Kirth via llvm-commits]

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

This looks good from my perspective. and I agree w/ @jh7370 about the compatibility and approach. Please do wait for his LGTM before landing, though.

Can you also include an example of the bad vs. corrected JSON in the commit message? Something minimal to show what's changed is probably fine.

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