core: add VM into interop context

pkg/core/interop/json/json.go

@@ -2,28 +2,27 @@ package json
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/core/interop"
-	"github.com/nspcc-dev/neo-go/pkg/vm"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
 
 // Serialize handles System.JSON.Serialize syscall.
-func Serialize(_ *interop.Context, v *vm.VM) error {
-	item := v.Estack().Pop().Item()
+func Serialize(ic *interop.Context) error {
+	item := ic.VM.Estack().Pop().Item()
 	data, err := stackitem.ToJSON(item)
 	if err != nil {
 		return err
 	}
-	v.Estack().PushVal(data)
+	ic.VM.Estack().PushVal(data)
 	return nil
 }
 
 // Deserialize handles System.JSON.Deserialize syscall.
-func Deserialize(_ *interop.Context, v *vm.VM) error {
-	data := v.Estack().Pop().Bytes()
+func Deserialize(ic *interop.Context) error {
+	data := ic.VM.Estack().Pop().Bytes()
 	item, err := stackitem.FromJSON(data)
 	if err != nil {
 		return err
 	}
-	v.Estack().PushVal(item)
+	ic.VM.Estack().PushVal(item)
 	return nil
 }