[clang-tools-extra] [clang-doc] add a JSON generator (PR #142483)

[Paul Kirth via cfe-commits]

https://github.com/ilovepi commented:

This is a good start, but I thin we'll want some more tests, and probably some unit test coverage. Unittesting is especially nice, since I believe this backend doesn't need any of the asset files, right?

As for whether this should follow the pattern of YAML or HTML ... I'm conflicted for the same reasons you are. But maybe there's a better way for us to generate the filename that doesn't need the USR? like could we get the mangled name and use that? I'd hope those would be different enough to not conflict. Alternatively, maybe we should look at a way we can merge all the related docinfo together at an earlier step.

https://github.com/llvm/llvm-project/pull/142483