Fix encoding of empty struct interface type #286
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fix #285
If encodes of empty struct value from interface type, go-json's compiler produces
OpStructHead - OpStructEnd - OpInterfaceEndoperations. In this case, OpStructHead's next operation (OpStructEnd) 's index is equalOpInterfaceEnd's index. So, when vm evaluated OpStructHead operation, stored value was overwritten.Therefore, I fixed this behavior by added index number for
OpStructEnd's next operation .