Rollup of 4 pull requests

Successful merges:

 - #56874 (Simplify foreign type rendering.)
 - #57113 (Move diagnostics out from QueryJob and optimize for the case with no diagnostics)
 - #57366 (Point at match discriminant on type error in match arm pattern)
 - #57538 (librustc_mir: Fix ICE with slice patterns)

Failed merges:

 - #57381 (Tweak output of type mismatch between "then" and `else` `if` arms)

r? @ghost

Tweak output of type mismatch between "then" and `else` `if` arms

```
error[E0308]: if and else have incompatible types
  --> $DIR/if-else-type-mismatch.rs:5:9
   |
LL |       let _ = if true {
   |  _____________-
LL | |         42i32
   | |         ----- expected because of this
LL | |     } else {
LL | |         42u32
   | |         ^^^^^ expected i32, found u32
LL | |     };
   | |_____- if and else have incompatible types
   |
   = note: expected type `i32`
              found type `u32`

error[E0308]: if and else have incompatible types
  --> file.rs:2:38
   |
LL |     let _ = if false { 3u8; } else { 3u8 };
   |                        ----          ^^^ expected (), found u8
   |                        |  |
   |                        |  help: consider removing this semicolon
   |                        expected because of this
   |
   = note: expected type `()`
              found type `u8`

error[E0308]: if and else have incompatible types
  --> file.rs:3:37
   |
LL |     let _ = if false { 3u8 } else { 3u8; };
   |                        ---          ^^^-
   |                        |            |  |
   |                        |            |  help: consider removing this semicolon
   |                        |            expected u8, found ()
   |                        expected because of this
   |
   = note: expected type `u8`
              found type `()`

error[E0308]: if and else have incompatible types
  --> file.rs:4:37
   |
LL |     let _ = if false { 3i8 } else { 3u8 };
   |                        ---          ^^^ expected i8, found u8
   |                        |
   |                        expected because of this
   |
   = note: expected type `i8`
              found type `u8`
```

Fix #57348.