[clang] [llvm] [Clang] Add diagnostic reasoning for unsatisfied is_destructible trait (PR #166967)

[via llvm-commits]

AnushaK6 wrote:

Thank you for catching that! I was working on a different issue and accidentally pushed those commits to the same branch.
Sincere apologies for the oversight.

I've raised a new PR with the correct changes for this issue [here](https://github.com/llvm/llvm-project/pull/167291)

https://github.com/llvm/llvm-project/pull/166967