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* Inferred error sets are stored in the return Type of the function, owned by the Module.Fn. So it cleans up that memory in deinit(). * Sema: update the inferred error set in zirRetErrValue - Update relevant code in wrapErrorUnion * C backend: improve some some instructions to take advantage of liveness analysis to avoid being emitted when unused. * C backend: when an error union has a payload type with no runtime bits, emit the error union as the same type as the error set.