[clang] [Clang][Sema] Properly get captured 'this' pointer in lambdas with an explicit object parameter in constant evaluator (PR #81102)

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Sirraide wrote:

Should I fix the conflict in the release notes myself, or should that be done when this gets merged? Because at least in my experience, merge conflicts in the release notes just keep reappearing if a pr stays open for some time...

https://github.com/llvm/llvm-project/pull/81102