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

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timon-ul wrote:

Alright, that was not as easy as I expected, mainly figuring out which are the correct functions to call in the case of being a template instantiation. Anyway this should cover the case and work for all indexes since it is done on the visitor side.

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