[PATCH] D40606: [Support/TarWriter] - Don't allow TarWriter to add the same file more than once.

[George Rimar via llvm-commits]

>It looks like you are trying to use StringSet<std::string>. The template
>argument is the allocator, not the type it holds. You should use just
>StringSet<>.
>
>Cheers,
>Rafael

Yeah, I misused it and did not notice it wants allocator :(

George.