[libcxx-commits] [libcxx] [libc++] Fix UB in <expected> related to "has value" flag (#68552) (PR #68733)

[Louis Dionne via libcxx-commits]

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https://github.com/ldionne approved this pull request.

Thanks for all the work on this!

This one is actually not an ABI break, so I would cherry-pick it back to LLVM 17 regardless of what we end up doing with the tail padding issue (which is the actual ABI breaking issue). I can handle that.

https://github.com/llvm/llvm-project/pull/68733