core/vm: implement metropolis static call opcode

core/vm/memory_table.go

@@ -74,6 +74,13 @@ func memoryDelegateCall(stack *Stack) *big.Int {
 	return math.BigMax(x, y)
 }
 
+func memoryStaticCall(stack *Stack) *big.Int {
+	x := calcMemSize(stack.Back(4), stack.Back(5))
+	y := calcMemSize(stack.Back(2), stack.Back(3))
+
+	return math.BigMax(x, y)
+}
+
 func memoryReturn(stack *Stack) *big.Int {
 	return calcMemSize(stack.Back(0), stack.Back(1))
 }