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* add error_union value tag. * add analyzeIsErr * add Value.isError * add TZIR wrap_errunion_payload and wrap_errunion_err for wrapping from T -> E!T and E -> E!T * add anlyzeInstUnwrapErrCode and analyzeInstUnwrapErr * add analyzeInstEnsureErrPayloadVoid: * add wrapErrorUnion * add comptime error comparison for tests * tests!