[clang] [Clang] Mark declarators invalid in the presence of ill-formed explicit parameters. (PR #70018)

[Mariya Podchishchaeva via cfe-commits]

https://github.com/Fznamznon commented:

Is there no release note because there is no release that supports explicit object parameters yet?

https://github.com/llvm/llvm-project/pull/70018