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Whenever a `ref` instruction is needed, it is created and saved in `AstGen.ref_table` instead of being immediately appended to the current block body. Then, when the referenced instruction is being added to the parent block (e.g. from setBlockBody), if it has a ref_table entry, then the ref instruction is added directly after the instruction being referenced. This makes sure two properties are upheld: 1. All pointers to the same locals return the same address. This is required to be compliant with the language specification. 2. `ref` instructions will dominate their uses. This is a required property of ZIR. A complication arises when a ref instruction refs another ref instruction. The logic in appendBodyWithFixups must take this into account, recursively handling ref refs.