Rollup merge of #131700 - practicalrs:fix_match_same_arms, r=celinval

Fix match_same_arms in stable_mir

Hi,

This PR fixes some clippy warnings

(Reopened https://github.com/rust-lang/rust/pull/131688)

```
warning: this match arm has an identical body to another arm
   --> compiler/stable_mir/src/mir/visit.rs:197:13
    |
197 | /             StatementKind::FakeRead(_, place) => {
198 | |                 self.visit_place(place, PlaceContext::NON_MUTATING, location);
199 | |             }
    | |_____________^
    |
    = help: try changing either arm body
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_same_arms
help: or try merging the arm patterns
    |
197 |             StatementKind::FakeRead(_, place) | StatementKind::PlaceMention(place) => {
    |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
help: and remove this obsolete arm
    |
209 -             StatementKind::PlaceMention(place) => {
210 -                 self.visit_place(place, PlaceContext::NON_MUTATING, location);
211 -             }
    |

```

Best regards,
Michal

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