Rollup merge of #132799 - zachs18:str-primitive-symbol, r=compiler-errors

Make `Ty::primitive_symbol` recognize `str`

Make `Ty::primitive_symbol` recognize `str`, which makes `str` eligible for the "expected primitive, found local type" (and vice versa) [diagnostic](https://github.com/rust-lang/rust/blob/master/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs#L1430-L1437) that already exists for other primitives.

<details><summary> diagnostic difference</summary>

```rs
#[allow(non_camel_case_types)]
struct str;

fn foo() {
    let _: &str = "hello";
    let _: &core::primitive::str = &str;
}
```

`rustc --crate-type lib --edition 2021 a.rs`

Current nightly:

```rs
error[E0308]: mismatched types
 --> a.rs:5:19
  |
5 |     let _: &str = "hello";
  |            ----   ^^^^^^^ expected `str`, found a different `str`
  |            |
  |            expected due to this
  |
  = note: expected reference `&str`
             found reference `&'static str`

error[E0308]: mismatched types
 --> a.rs:6:36
  |
6 |     let _: &core::primitive::str = &str;
  |            ---------------------   ^^^^ expected `str`, found a different `str`
  |            |
  |            expected due to this
  |
  = note: expected reference `&str` (`str`)
             found reference `&str` (`str`)

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.
```

With this patch:

```rs
error[E0308]: mismatched types
 --> a.rs:5:19
  |
5 |     let _: &str = "hello";
  |            ----   ^^^^^^^ expected `str`, found a different `str`
  |            |
  |            expected due to this
  |
  = note: str and `str` have similar names, but are actually distinct types
  = note: str is a primitive defined by the language
note: `str` is defined in the current crate
 --> a.rs:2:1
  |
2 | struct str;
  | ^^^^^^^^^^

error[E0308]: mismatched types
 --> a.rs:6:36
  |
6 |     let _: &core::primitive::str = &str;
  |            ---------------------   ^^^^ expected `str`, found a different `str`
  |            |
  |            expected due to this
  |
  = note: str and `str` have similar names, but are actually distinct types
  = note: str is a primitive defined by the language
note: `str` is defined in the current crate
 --> a.rs:2:1
  |
2 | struct str;
  | ^^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.
```

</details>

0 files changed, 0 insertions, 0 deletions