[clang] [Clang] Check explicit object parameter for defaulted operators properly (PR #100419)

[Mital Ashok via cfe-commits]

MitalAshok wrote:

@marco-antognini-sonarsource <https://llvm.org/docs/HowToReleaseLLVM.html#release-patch-rules>: It's before RC3 and this isn't a regression (this just never worked), and I don't think #100329 is a critical bug, so this probably shouldn't go in the 19.x branch. Especially considering this PR was opened after it branched off.


https://github.com/llvm/llvm-project/pull/100419