[clang] [Clang] Fix __is_trivially_equality_comparable returning true with ineligebile defaulted overloads (PR #93113)

[Nikolas Klauser via cfe-commits]

philnik777 wrote:

@ZequanWu Could you give me a reproducer? Ther CI failure looks pretty unrelated to me, since it complains about LeakSanitizer. The next build was also green.

https://github.com/llvm/llvm-project/pull/93113