Chandler Carruth 480f5d265a Lift self-copy protection up to the header file and add self-move ...

protection to the same layer.

This is in line with Howard's advice on how best to handle self-move
assignment as he explained on SO[1]. It also ensures that implementing
swap with move assignment continues to work in the case of self-swap.

[1]: http://stackoverflow.com/questions/9322174/move-assignment-operator-and-if-this-rhs

llvm-svn: 195705

2013-11-26 00:54:44 +00:00

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