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

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timon-ul wrote:

Laying in bed yesterday I realized that yeah I need to fix that, basically all instantiations of such a template, even if they have the wrong type parameter will be returned now, which is definitely not intended behaviour, the code is missing a way to say "only record a reference for this specialization" and not "for all specializations". 

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