[clang-tools-extra] [clangd] Support callHierarchy/outgoingCalls (PR #91191)

[Christian Kandeler via cfe-commits]

ckandeler wrote:

> I remembered @HighCommander4 had filed a similar PR at #77556. Is this one separate, or are they actually the same (i.e. both are salvaged from https://reviews.llvm.org/D93829)?

I didn't know about that one. Seems nothing gets reviewed anymore these days.

https://github.com/llvm/llvm-project/pull/91191