Alex Kladov 4620972d08 Sema: preserve extern struct field alignment
In

    extern struct { x: u32, y: u16 }

we actually know that y's alignment is `@alignOf(u32)`, and not just
`@alignOf(u16)`.

closes: #16134
2023-06-28 16:36:32 +02:00
..
2023-06-25 14:51:03 -07:00