Redo how instance variables work #409
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We must deny it for soundness
To ensure we do maybe-uninitialized structs like IvarEncode correctly
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To make it easier to see what's going on beneath the hood (instance variable names and class names will be available in the final binary, which is important to be aware of)!
This also fixes accidentally overwritten instance variables in superclasses (which is very important for soundly using instance variables).