[clang] [clang] CWG2398: improve overload resolution backwards compat (PR #107350)

[via cfe-commits]

cor3ntin wrote:

Does that implement https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p3310r0.html#wording-to-2 exactly?

https://github.com/llvm/llvm-project/pull/107350