Auto merge of rust-lang#111071 - nyurik:simpler-issue-94005, r=m-ou-se

Cleaner assert_eq! & assert_ne! panic messages

This PR finishes refactoring of the assert messages per rust-lang#94005. The panic message format change rust-lang#112849 used to be part of this PR, but has been factored out and just merged. It might be better to keep both changes in the same release once FCP vote completes.

Modify panic message for `assert_eq!`, `assert_ne!`, the currently unstable `assert_matches!`, as well as the corresponding `debug_assert_*` macros.

```rust
assert_eq!(1 + 1, 3);
assert_eq!(1 + 1, 3, "my custom message value={}!", 42);
```

#### Old messages
```plain
thread 'main' panicked at $DIR/main.rs:6:5:
assertion failed: `(left == right)`
  left: `2`,
 right: `3`
```
```plain
thread 'main' panicked at $DIR/main.rs:6:5:
assertion failed: `(left == right)`
  left: `2`,
 right: `3`: my custom message value=42!
```

#### New messages
```plain
thread 'main' panicked at $DIR/main.rs:6:5:
assertion `left == right` failed
  left: 2
 right: 3
```

```plain
thread 'main' panicked at $DIR/main.rs:6:5:
assertion `left == right` failed: my custom message value=42!
  left: 2
 right: 3
```

History of fixing rust-lang#94005
* rust-lang#94016 was a lengthy PR that was abandoned
* rust-lang#111030 was similar, but it stringified left and right arguments, and thus caused compile time performance issues, thus closed
* rust-lang#112849 factored out the two-line formatting of all panic messages

Fixes rust-lang#94005

r? `@m-ou-se`

Author: bors

core/src/panicking.rs

@@ -267,16 +267,14 @@ fn assert_failed_inner(
 
     match args {
         Some(args) => panic!(
-            r#"assertion failed: `(left {} right)`
-  left: `{:?}`,
- right: `{:?}`: {}"#,
-            op, left, right, args
+            r#"assertion `left {op} right` failed: {args}
+  left: {left:?}
+ right: {right:?}"#
         ),
         None => panic!(
-            r#"assertion failed: `(left {} right)`
-  left: `{:?}`,
- right: `{:?}`"#,
-            op, left, right,
+            r#"assertion `left {op} right` failed
+  left: {left:?}
+ right: {right:?}"#
         ),
     }
 }