fb3ea63d9b
Fix ICEs on invalid vtable size/alignment const UB errors The invalid vtable size/alignment errors from `InterpCx::read_size_and_align_from_vtable` were "freeform const UB errors", causing ICEs when reaching validation. This PR turns them into const UB hard errors to catch them during validation and avoid that. Fixes #86193 r? `@RalfJung` (It seemed cleaner to have 2 variants but they can be merged into one variant with a message payload if you prefer that ?)
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