Let swap over CloneableUniquePtr be found with ADL
Let swap over CloneableUniquePtr be found with ADL

Summary:
[Thrift] Let `swap` over `CloneableUniquePtr` be found with ADL.

This is the proper way to overload `swap`. Note: not to specialize `std::swap`!

Reviewed By: phoad, pixelb

Differential Revision: D6920578

fbshipit-source-id: 53024102e4f40861752b2d440dd328ded7ff74a5

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