gccgo: "error: esc already decorated call" on valid program

```
$ gccgo --version
gccgo (Debian 13.2.0-4) 13.2.0
```
```
package main

func f(s string) int {
	return len([]byte(s))
}

func main() {
	for _, e := range make([]int, f("abc")) {
		println(e)
	}
}
```
```
$ gccgo crash.go 
go1: error: esc already decorated call f("abc")
```

Compiles and runs fine on gc.