Rollup merge of #72456 - ldm0:dereftrait, r=estebank

Try to suggest dereferences on trait selection failed

Fixes #39029 Fixes #62530
This PR consists of two parts:
1. Decouple `Autoderef` with `FnCtxt` and move `Autoderef` to `librustc_trait_selection`.
2. Try to suggest dereferences when trait selection failed.

The first is needed because:
1. For suggesting dereferences, the struct `Autoderef` should be used. But before this PR, it is placed in `librustc_typeck`, which depends on `librustc_trait_selection`. But trait selection error emitting happens in `librustc_trait_selection`, if we want to use `Autoderef` in it, dependency loop is inevitable. So I moved the `Autoderef` to `librustc_trait_selection`.
2. Before this PR, `FnCtxt` is coupled to `Autoderef`, and `FnCtxt` only exists in `librustc_typeck`. So decoupling is needed.

After this PR, we can get suggestion like this:
```
error[E0277]: the trait bound `&Baz: Happy` is not satisfied
  --> $DIR/trait-suggest-deferences-multiple.rs:34:9
   |
LL | fn foo<T>(_: T) where T: Happy {}
   |                          ----- required by this bound in `foo`
...
LL |     foo(&baz);
   |         ^^^^
   |         |
   |         the trait `Happy` is not implemented for `&Baz`
   |         help: consider adding dereference here: `&***baz`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
```

r? @estebank

0 files changed, 0 insertions, 0 deletions