cmd/compile: wrong type reported for generic cyclic interface

```Go
package main

import "fmt"

type I[R any] interface{ m() R }
type J interface{ I[interface{ J }] }

func main() {
	fmt.Printf("%T\n", J.m)
}
```
reports the wrong type when [run](https://go.dev/play/p/vZXbzyWQ6Oz?v=gotip):
```
func(main.J) interface {}
```
(reported by @mdempsky)