fix: correct new() when using in indirect assign (#202)

_test/new1.go

@@ -0,0 +1,13 @@
+package main
+
+import "fmt"
+
+func main() {
+	a := [1]*int{}
+	a[0] = new(int)
+	*a[0] = 2
+	fmt.Println(*a[0])
+}
+
+// Output:
+// 2

interp/run.go

@@ -1769,12 +1769,12 @@ func _len(n *Node) {
 }
 
 func _new(n *Node) {
-	i := n.findex
+	dest := genValue(n)
 	next := getExec(n.tnext)
 	typ := n.child[1].typ.TypeOf()
 
 	n.exec = func(f *Frame) Builtin {
-		f.data[i] = reflect.New(typ)
+		dest(f).Set(reflect.New(typ))
 		return next
 	}
 }