PhaseII verified: Fix permission model for smart pointers #254
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I found I made a mistake about the permission produced by
Arc::into_rawin #253. UnlikeBox::into_raw, it does not decrease the reference counter, so it gives astaticshared memory permission and noDeallocpermission. Now I unify different permissions in theSmartPtrPointsToenum and replace the wrong ghost parameters in theNonNullPtrtrait.