[clang] [clang] Bugfix for choosing the more specialized overload (PR #83279)

[Botond István Horváth via cfe-commits]

HoBoIs wrote:

@erichkeane a question: this PR is partly a fix for a DR for c++20. Right now I only apply the fix for C++20 and newer. Is there a reason for not applying this fix for older standards? I don't see how it would break any existing code, and making the fix retroactive doesn't make any test fail.

https://github.com/llvm/llvm-project/pull/83279