Simplify Unit
Summary: [Folly] Simplify `Unit`. Specifically: * Make `Unit::Lift` and `Unit::Drop` simply be aliases to `std::conditional<...>`. No need for anything more complicated. * Remove `is_void_or_unit`, which is unused and unnecessary. Reviewed By: djwatson Differential Revision: D3312481 fbshipit-source-id: 280d40aa8ef91c52f96a51b03e0a109d76c939ec
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