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Richard Smith
e3c15edb92
Instead of redundantly storing both the `return_type_id` and `return_storage_id`, where the declared return type is just the type of the return storage, store only the `return_storage_id`. Add a convenience property to get the declared return type of the function. In addition to avoiding storing redundant information, this is a preparatory step for an upcoming change for generics support that will make it more expensive and awkward to store `TypeId`s in places other than the type of an instruction.