Auto merge of #23972 - gkoz:partial_eq_str_string, r=alexcrichton

Right now comparing a `&String` (or a `&Cow`) to a `&str` requires redundant borrowing of the latter. Implementing `PartialEq<str>` tries to avoid this limitation.

```rust
struct Foo (String);

fn main () {
    let s = Foo("foo".to_string());
    match s {
        Foo(ref x) if x == &"foo" => println!("foo!"),
        // avoid this -----^
        _ => {}
    }
}
```

I was hoping that #23521 would solve this but it didn't work out.

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