[llvm] r255831 - Simplify memory management with std::unique_ptr.

[Rafael Espíndola via llvm-commits]

> Looks like now that this doesn't need explicit cleanup, you could remove the
> variable, but that might be a bit unclear:
>
> PrintStatistics(*CreateInfoOutputFile());

That would look odd without a clear indication that it is a unique_ptr.

> Can (or is it already) raw_ostream be made movable? In which case
> CretaeInfoInputFile could return by value? (but I guess then you couldn't
> take a non-const ref to it to pass it to something else anyway...)

It might be possible, but it is not clear if it is worth the effort.

Cheers,
Rafael