lib/reflect: fix closure pointer

cl/_testgo/reflectfn/in.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+func demo() {
+	println("demo")
+}
+
+func main() {
+	v := 100
+	fn := func() {
+		println(v)
+	}
+	fdemo := demo
+	fmt.Println(fn)
+	fmt.Println(demo)
+	fmt.Println(fdemo)
+	fmt.Println(reflect.ValueOf(fn).UnsafePointer())
+	fmt.Println(reflect.ValueOf(demo).UnsafePointer())
+	fmt.Println(reflect.ValueOf(fdemo).UnsafePointer())
+}