[llvm] [llvm-readobj][ELF] Fix broken JSON output with --dynamic-table (PR #95976)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> Fix broken JSON output

The subject can probably say Implement JSON output for . The JSON output supports a few dump options and -d is not implemented yet.

https://github.com/llvm/llvm-project/pull/95976