[clang] [Clang] [CodeGen] Perform derived-to-base conversion on explicit object parameter in lambda (PR #89828)

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Sirraide wrote:

Ok, I’ve looked into this a bit more, and it seems that checking for this at instantiation time ends up being more complicated and produces more diagnostics than just checking it at the call site; I’ve added a comment about that.

Other than that, is there anything else that we should look into here?

https://github.com/llvm/llvm-project/pull/89828