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f131a0a771
Add method to convert internal to stable constructs This is an alternative implementation to https://github.com/rust-lang/rust/pull/116999. I believe we can still improve the logic a bit here, but I wanted to see which direction we should go first. In this implementation, the API is simpler and we keep Tables somewhat private. The definition is still public though, since we have to expose the Stable trait. However, there's a cost of keeping another thread-local and using `Rc`, but I'm hoping it will be a small cost. r? ``@oli-obk`` r? ``@spastorino``