Improve OpCallTyped performance

Author: antonmedv

vm/vm.go

@@ -377,9 +377,7 @@ func (vm *VM) Run(program *Program, env interface{}) (_ interface{}, err error)
 			vm.push(fn(in...))
 
 		case OpCallTyped:
-			fn := vm.pop()
-			out := vm.call(fn, arg)
-			vm.push(out)
+			vm.push(vm.call(vm.pop(), arg))
 
 		case OpCallBuiltin1:
 			vm.push(builtin.Functions[arg].Builtin1(vm.pop()))