[llvm] [libc++] Ensure that `std::expected` has no tail padding (PR #69673)

[Richard Smith via llvm-commits]

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zygoloid wrote:

> Internally, the `repr` struct still needs to call `std::construct_at`/`std::destroy_at` sometimes on its `[[no_unique_address]]` members. Not sure if that is OK...

`destroy_at` (or a manual destructor call) is OK, but `construct_at` (or placement new) is not.


https://github.com/llvm/llvm-project/pull/69673