[libcxx-commits] [libcxx] [libc++][ranges][abi-break] Fix `movable_box` overwriting memory of data that lives in the tail padding (PR #71314)

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timsong-cpp wrote:

You don't need the `memset` for the assert to fail - since `construct_at` performs value-initialization in that case, the memset will fail as long as value-initialization for the class performs zero-initialization (i.e., if the class has a non-user-provided default constructor).

https://github.com/llvm/llvm-project/pull/71314