[PATCH] Implement std::experimental::sample

[Evgeniy Stepanov]

================
Comment at: include/experimental/algorithm:40
@@ +39,3 @@
+#include <algorithm>
+
+_LIBCPP_BEGIN_NAMESPACE_LFTS
----------------
EricWF wrote:
> This should probably have the system header pragma found in most other headers.
done

http://reviews.llvm.org/D9044

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