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

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

> Appears to work fine. Regarding the slight memory increase: If anyone feels strongly about it, they had plenty of time to chime in.

Thanks! I'll go ahead and merge.

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