Fix not complete mut and raw in &x.foo()

Example
---
```rust
fn main() {
    let _ = &$0x.foo();
}
```

**Before this PR**

```rust
...
kw loop
kw match
kw return
kw self::
...
```

**After this PR**

```rust
...
kw loop
kw match
kw mut
kw raw
kw return
kw self::
...
```

src/tools/rust-analyzer/crates/ide-completion/src/context/analysis.rs

@@ -1305,14 +1305,14 @@ fn classify_name_ref<'db>(
 
     let make_path_kind_expr = |expr: ast::Expr| {
         let it = expr.syntax();
+        let prev_token = iter::successors(it.first_token(), |it| it.prev_token())
+            .skip(1)
+            .find(|it| !it.kind().is_trivia());
         let in_block_expr = is_in_block(it);
         let (in_loop_body, innermost_breakable) = is_in_breakable(it).unzip();
         let after_if_expr = is_after_if_expr(it.clone());
-        let ref_expr_parent =
-            path.as_single_name_ref().and_then(|_| it.parent()).and_then(ast::RefExpr::cast);
-        let after_amp = non_trivia_sibling(it.clone().into(), Direction::Prev)
-            .map(|it| it.kind() == SyntaxKind::AMP)
-            .unwrap_or(false);
+        let after_amp = prev_token.as_ref().is_some_and(|it| it.kind() == SyntaxKind::AMP);
+        let ref_expr_parent = prev_token.and_then(|it| it.parent()).and_then(ast::RefExpr::cast);
         let (innermost_ret_ty, self_param) = {
             let find_ret_ty = |it: SyntaxNode| {
                 if let Some(item) = ast::Item::cast(it.clone()) {

src/tools/rust-analyzer/crates/ide-completion/src/tests/expression.rs

@@ -706,7 +706,30 @@ fn completes_after_ref_expr() {
             kw while
             kw while let
         "#]],
-    )
+    );
+    check(
+        r#"fn main() { let _ = &$0x.foo() }"#,
+        expect![[r#"
+            fn main() fn()
+            bt u32     u32
+            kw const
+            kw crate::
+            kw false
+            kw for
+            kw if
+            kw if let
+            kw loop
+            kw match
+            kw mut
+            kw raw
+            kw return
+            kw self::
+            kw true
+            kw unsafe
+            kw while
+            kw while let
+        "#]],
+    );
 }
 
 #[test]