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

[via cfe-commits]

cor3ntin wrote:

> @cor3ntin There already was a FIXME to consider moving this check to where the call operator is first instantiated; should I look into that as well or is it fine to leave this here? Asking because I’m assuming there’s a reason why it wasn’t done that way.

If you can do it easily, you should!
I don't remember the details sadly, It's been over a year!

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