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Just batching some cherry-picks in order to lower the amount of times I need to ping the branch managers.
This PR contains the following changes:
Explanation: This changes the noncopyable types implementation in two ways: 1. It adds support for handling structs without any fields to the move checker. This was done by just saying that they artificially have a single field rather than no fields. 2. It changes the implementation around validating that we do not partially invalidate types with deinits to use AST information instead of SIL level information. I also used this as an opportunity to insert a new note on the deinit itself that is causing the error so it shows up in the IDE.
Scope: Only affects noncopyable types since it only changes the move only checkers.
Risk: Low.
Testing: Added compiler tests