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

[Amirreza Ashouri via cfe-commits]

AMP999 wrote:

Could you explain a bit about why we check `Decl->isTriviallyCopyable()` here?


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