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The implementation of mem_fn doesn't actually require any C++11 support. For some reason there were 17 overloads for mem_fn in C++03 when only one is needed. This patch removes the extra overloads and uses the same implementation of mem_fn in C++03 and C++11. __mem_fn does require variadics to implement the call operator. Instead of having two entirely different implementations of the __mem_fn struct, this patch uses the same __mem_fn struct but provides different call operators when variadics are not available. The only thing left in <__functional_03> is the C++03 implementation of std::function. llvm-svn: 242959