Files
Avi Patel 095e9a16ea [libc++] Implement LWG4472: std::atomic_ref<const T> can be constructed from temporaries (#208131)
## Summary
- Implements LWG4472, i.e., adds a deleted `atomic_ref(T&&)` overload to
the primary template and three partial specializations of `atomic_ref`.


## Test
- Added `static_assert`s in `ctor.pass.cpp` asserting
`atomic_ref<T>`/`atomic_ref<const T>` reject construction from
`T&&`/`const T&&`.

Resolve #189840
2026-07-09 18:29:43 +08:00
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