Auto merge of #86138 - FabianWolff:issue-85871, r=nikomatsakis

Check whether the closure's owner is an ADT in thir-unsafeck

This pull request fixes #85871. The code in `rustc_mir_build/src/check_unsafety.rs` incorrectly assumes that a closure's owner always has a body, but only functions, closures, and constants have bodies, whereas a closure can also appear inside a struct or enum:
```rust
struct S {
    arr: [(); match || 1 { _ => 42 }]
}

enum E {
    A([(); { || 1; 42 }])
}
```
This pull request fixes the resulting ICE by checking whether the closure's owner is an ADT and only deferring to `thir_check_unsafety(owner)` if it isn't.

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