[clang-tools-extra] [clangd] Re-land "support outgoing calls in call hierarchy" (PR #117673)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

> Any chance this is backportable to the 19.x series? Or is it too dependent on changes since then?
> 
> Or even better 18.x? (since a lot of downstream tools are dependent on 18.x and will be a while before they bump to 19)

If you're asking about the change being backported to appear in an official 19.x release, then I believe it would not be eligible for that; the release branch only accepts backports of regression and other serious bug fixes, not new features.

If you're asking whether the patch would apply cleanly to the 19.x release branch, for the purpose of applying it to some downstream repository that's based on llvm 19.x: while I haven't tried, I expect it should be possible to rebase the patch with fairly minimal changes. This is probably true of 18.x as well. If you try this and have a question about a specific conflict, I'm happy to provide suggestions.

https://github.com/llvm/llvm-project/pull/117673