[libc++] Add tests to pin down the ABI of deque, list and vector (#80191) This patch adds tests that lock down the ABI of types like deque, list and vector. An upcoming patch will replace the usage of __compressed_pair in these classes by [[no_unique_address]], so we are adding these tests to pin down their ABI before making the change. That way, we can be confident that the patch making the actual ABI-sensitive change is safe if it doesn't break these tests.
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