`ownership` is a bad name in `LoadInst`, because it hides `Value.ownership`.
Therefore rename it to `loadOwnership`.
Do the same for ownership in StoreInst to be consistent.
* add the StaticInitCloner utility
* remove bridging of `copyStaticInitializer` and `createStaticInitializer`
* add `Context.mangleOutlinedVariable` and `Context.createGlobalVariable`