[7.x][ML] Work around compile error in old Xcode #700
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The problem is described in https://stackoverflow.com/questions/7411515/why-does-c-require-a-user-provided-default-constructor-to-default-construct-a Moving construction of the hasher object into the checksum method won't matter in practice as the constructor is a no-op and the object has no data members, so it should get completely optimised away. Backport of elastic#699
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The problem is described in
https://stackoverflow.com/questions/7411515/why-does-c-require-a-user-provided-default-constructor-to-default-construct-a
Moving construction of the hasher object into the checksum
method won't matter in practice as the constructor is a
no-op and the object has no data members, so it should get
completely optimised away.
Backport of #699