Additional traits for std::mem::ManuallyDrop
Additional traits for std::mem::ManuallyDrop

Add pass-through implementations for all of the derivable traits. These
cannot be derived since ManuallyDrop is a union.

aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust