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

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Sirraide wrote:

It seems that a parameter to `getAddress()` that wasn’t being used has been removed, which caused builds to break after I merged this. My bad; I’ve already pushed a fix for this: #93086. I didn’t wait for CI this time because it was passing before (except for an unrelated issue), and I figured it wouldn’t be a problem because that was 2 days ago (it usually isn’t a problem in my experience at least), but the timing here was a bit unfortunate this time...

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