interpret: remove an incorrect assertion
This fixes an ICE in Miri, [reported](https://rust-lang.zulipchat.com/#narrow/stream/269128-miri/topic/SwitchInt.20with.20no.20targets.3F) by `@saethlin.` The faulty assertion was introduced by
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| .. | ||
| const_eval | ||
| interpret | ||
| transform | ||
| util | ||
| errors.rs | ||
| lib.rs | ||