sema: fix safe integer arithmetic operations on undefined values
Previously `@as(i64, undefined) +% 1` would produce `@as(@TypeOf(undefined), undefined)` which now gives `@as(i64, undefined)`.
Previously `@as(i64, undefined) +| 1` would hit an assertion which now gives `@as(i64, undefined)`.
ec358d6db5Techatrix committed on 1/17/2024, 12:27:31 AM· committed by Andrew Kelleyparent4ace1f5