swift

29eece84 - [CloudKit overlay] Work around an NSError bridging issue specific to CKError.

[CloudKit overlay] Work around an NSError bridging issue specific to CKError. While here, fix up the type signature of CKError.partialErrorsByItemID; it doesn't make sense to use NSObject now that we have AnyHashable. Fixes rdar://problem/27936562. (cherry picked from commit 661df18a884bd7adde6df47b7dc3a368ce981b6e)