[clang] [Clang] Added explanation why a is trivial copyable evaluated to false. (PR #142341)

[Shamshura Egor via cfe-commits]

egorshamshura wrote:

> LGTM! Thanks a lot. Will you need us to merge that for you?

Yep, that would be great



https://github.com/llvm/llvm-project/pull/142341