[libcxx-commits] [libcxx] [libc++] Implement P1901R2: owner_hash and owner_equal for shared_ptr/weak_ptr (PR #210551)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

IMO the current PR description (which will be used in the squashed commit message) is a bit redundant, because most information can be inferred from the paper ([P1901R2](https://wg21.link/p1901r2)) and the list of new test files.

Would you mind to reduce the PR description as the following?

```
Fixes #105372.

## Acknowledgements

Claude assisted with test development.
```

https://github.com/llvm/llvm-project/pull/210551