Auto merge of #123239 - Urgau:dangerous_implicit_autorefs, r=jdonszelmann,traviscross

Implement a lint for implicit autoref of raw pointer dereference - take 2

*[t-lang nomination comment](rust-lang/rust#123239 (comment)

This PR aims at implementing a lint for implicit autoref of raw pointer dereference, it is based on #103735 with suggestion and improvements from rust-lang/rust#103735 (comment).

The goal is to catch cases like this, where the user probably doesn't realise it just created a reference.

```rust
pub struct Test {
    data: [u8],
}

pub fn test_len(t: *const Test) -> usize {
    unsafe { (*t).data.len() }  // this calls <[T]>::len(&self)
}
```

Since #103735 already went 2 times through T-lang, where they T-lang ended-up asking for a more restricted version (which is what this PR does), I would prefer this PR to be reviewed first before re-nominating it for T-lang.

----

Compared to the PR it is as based on, this PR adds 3 restrictions on the outer most expression, which must either be:
   1. A deref followed by any non-deref place projection (that intermediate deref will typically be auto-inserted)
   2. A method call annotated with `#[rustc_no_implicit_refs]`.
   3. A deref followed by a `addr_of!` or `addr_of_mut!`. See bottom of post for details.

There are several points that are not 100% clear to me when implementing the modifications:
 - ~~"4. Any number of automatically inserted deref/derefmut calls." I as never able to trigger this. Am I missing something?~~ Fixed
 - Are "index" and "field" enough?

----

cc `@JakobDegen` `@WaffleLapkin`
r? `@RalfJung`

try-job: dist-various-1
try-job: dist-various-2

Author: bors

tests/pass/dst-raw.rs

@@ -1,5 +1,7 @@
 // Test DST raw pointers
 
+#![allow(dangerous_implicit_autorefs)]
+
 trait Trait {
     fn foo(&self) -> isize;
 }

tests/pass/stacked-borrows/interior_mutability.rs

@@ -1,3 +1,5 @@
+#![allow(dangerous_implicit_autorefs)]
+
 use std::cell::{Cell, Ref, RefCell, RefMut, UnsafeCell};
 use std::mem::{self, MaybeUninit};