Add v3 actors support for account

chain/actors/builtin/account/account.go

@@ -13,6 +13,7 @@ import (
 
 	builtin0 "github.com/filecoin-project/specs-actors/actors/builtin"
 	builtin2 "github.com/filecoin-project/specs-actors/v2/actors/builtin"
+	builtin3 "github.com/filecoin-project/specs-actors/v3/actors/builtin"
 )
 
 func init() {
@@ -32,6 +33,8 @@ func Load(store adt.Store, act *types.Actor) (State, error) {
 		return load0(store, act.Head)
 	case builtin2.AccountActorCodeID:
 		return load2(store, act.Head)
+	case builtin3.AccountActorCodeID:
+		return load3(store, act.Head)
 	}
 	return nil, xerrors.Errorf("unknown actor code %s", act.Code)
 }

chain/actors/builtin/account/v3.go

@@ -0,0 +1,30 @@
+package account
+
+import (
+	"github.com/filecoin-project/go-address"
+	"github.com/ipfs/go-cid"
+
+	"github.com/filecoin-project/lotus/chain/actors/adt"
+
+	account3 "github.com/filecoin-project/specs-actors/v3/actors/builtin/account"
+)
+
+var _ State = (*state3)(nil)
+
+func load3(store adt.Store, root cid.Cid) (State, error) {
+	out := state3{store: store}
+	err := store.Get(store.Context(), root, &out)
+	if err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+type state3 struct {
+	account3.State
+	store adt.Store
+}
+
+func (s *state3) PubkeyAddress() (address.Address, error) {
+	return s.Address, nil
+}