[PATCH] [MemCpyOpt] Turn memcpy from just-memset'd source into memset.

[Ahmed Bougacha]

Thanks for looking into it Daniel!

r237506.  FWIW, I realized that std::swap move constructors might me more frequent than I thought, since I don't think there's another way to move a class for which no move constructors was provided (if you can't change it, but have an std::swap specialisation).

-Ahmed


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