x/tools/internal/refactor/inline: do not inline a function that directly calls recover()

See https://news.ycombinator.com/item?id=47391964.

We should reject inlining of functions that directly call `recover()` as this changes their behavior:
```
 package main
    
    //go:fix inline
    func handle() {
        recover()
    }
    
    func foo() {
        handle() // not safe to inline!
    }
    
    func main() {
        defer foo()
        panic("bye")
    }
```