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- Make all instructions store their argument count for now, so we can iterate over them easily.
- Longer term we might try to optimize for space because the common case is that the operand count is known, but keeping it simpler seems better for now
- Split apart the creation of an instruction from adding it to a parent
- Use the above capability to make sure that we add a function to its parent *after* all the parameter/result type emission has occured.
- Perform simple value numbering for types during IR creation
- This logic also tries to pick a good parent for any type instructions, so that types don't get created local to a function unless they really need to
- Create all constants at global scope, and re-use when values are identical
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