Remove incorrect invariant for [Apply] #1239
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The check of the arity in the
[Never_returns]case was not correct.We can now infer that some applications never return (see the added example, although it requires to use return types and thus the
-flambda2-return-type-all-functionsoption), thus the arity check is simply incorrect (it was written at a time where only a few extcalls were marked asNever_returnsand all those had a nullary arity).