[clangd-dev] Querying the index for derived classes

[Nathan Ridge via clangd-dev]

I posted a WIP implementation of type hierarchy subtypes here:

https://reviews.llvm.org/D58880

It's incomplete, but there should be enough there to critique the proposed index model and index API changes on a high level. I would welcome feedback on whether my approach, which is adding a "Relations" entry to the index in addition to Symbols and Refs, is reasonable.

Thanks,
Nate