core/vm: fix invalid merkle root caused by PR #627 (#1033)

Author: gzliudan

core/vm/evm.go

@@ -366,7 +366,9 @@ func (evm *EVM) StaticCall(caller ContractRef, addr common.Address, input []byte
 	// This doesn't matter on Mainnet, where all empties are gone at the time of Byzantium,
 	// but is the correct thing to do and matters on other networks, in tests, and potential
 	// future scenarios
-	evm.StateDB.AddBalance(addr, big0)
+	if evm.ChainConfig().IsTIPXDCXCancellationFee(evm.Context.BlockNumber) {
+		evm.StateDB.AddBalance(addr, big0)
+	}
 
 	// Invoke tracer hooks that signal entering/exiting a call frame
 	if evm.Config.Tracer != nil {