[clang-tools-extra] clangd: Extend reference search with constructor calls through forwarding (PR #169742)

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timon-ul wrote:

Decided that while I wait I just add the handling for chain forwarding. Did not seem that complicated the more I thought about it. Not sure if I should have checked for it being the same arguments being passed on. 

Also I assume caching for the chained forwarding is probably wasted given I don't expect the inner instantiation to be reused much.

https://github.com/llvm/llvm-project/pull/169742