[llvm] llvm-dwarfdump --verify aggregated output to JSON file (PR #81762)

[Kevin Frei via llvm-commits]

kevinfrei wrote:

@clayborg had some excellent feedback on the [GsymUtil PR](https://github.com/llvm/llvm-project/pull/81763) that I'm going to put in here, too.

https://github.com/llvm/llvm-project/pull/81762