LLVM 22.1.8
[libc++] Disable mistakenly enabled `optional<T&>` constructors for `optional<T>` (#194446) Resolves #194415 - A constructor specifically meant for `optional<T&>` was left enabled for `optional<T>` - Fix it, and add a test to check for regression. - This patch also corrects the constraints for `optional(optional<U>&)` and `optional(const optional<U>&)` , as they were incorrectly disallowing [valid conversions](https://godbolt.org/z/1r5Ea7z5M) - Also, correct the `noexcept` specification. - Add tests for both corrections. (cherry picked from commit 239189ca28847aa4797368827107c22c32080509)
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