[clang-tools-extra] [clangd] Support outgoing calls in call hierarchy (PR #77556)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

@ckandeler, perhaps you would be willing to review this patch? I don't seem to have gotten any traction from my usual reviewers over the course of the past year.

https://github.com/llvm/llvm-project/pull/77556