Workaround for cases where we emit illegal-but-unused types

This is a quick workaround to deal with cases where we try to emit an unreferenced IR type that contains references to pre-legalization types (which might have been removed from the IR even thought they are still referenced). The basic fix is to *not* add types to our global order of instructions to emit by default, and only add them on demand as they are referenced by other instructions.

This is not a real fix for the underlying issue, which is that type legalization is only being applied to a subset of global instructions instead of all of them. A more detailed fix for that problem will need to be devised next.

This fix also doesn't address the question of why an unreferenced `struct` type came to be present in the IR code passed to the back-end in the first place. It would be good to understand how this scenario is arising.

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