Merge tag 'alloc-next-v6.16-2025-05-13' of https://github.com/Rust-for-Linux/linux into rust-next

Pull alloc updates from Danilo Krummrich:
 "Box:

   - Support for type coercion, e.g. 'Box<T>' to 'Box<dyn U>' if T
     implements U

  Vec:

   - Implement new methods (prerequisites for nova-core and binder)
      - Vec::truncate()
      - Vec::resize()
      - Vec::clear()
      - Vec::pop()
      - Vec::push_within_capacity()
         - New error type: PushError
      - Vec::drain_all()
      - Vec::retain()
      - Vec::remove()
         - New error type: RemoveError
      - Vec::insert_within_capacity
         - New error type: InsertError

   - Simplify Vec::push() using Vec::spare_capacity_mut()

   - Split Vec::set_len() into Vec::inc_len() and Vec::dec_len()
      - Add type invariant Vec::len() <= Vec::capacity
      - Simplify Vec::truncate() using Vec::dec_len()"

* tag 'alloc-next-v6.16-2025-05-13' of https://github.com/Rust-for-Linux/linux:
  rust: alloc: add Vec::insert_within_capacity
  rust: alloc: add Vec::remove
  rust: alloc: add Vec::retain
  rust: alloc: add Vec::drain_all
  rust: alloc: add Vec::push_within_capacity
  rust: alloc: add Vec::pop
  rust: alloc: add Vec::clear
  rust: alloc: replace `Vec::set_len` with `inc_len`
  rust: alloc: refactor `Vec::truncate` using `dec_len`
  rust: alloc: add `Vec::dec_len`
  rust: alloc: add Vec::len() <= Vec::capacity invariant
  rust: alloc: allow coercion from `Box<T>` to `Box<dyn U>` if T implements U
  rust: alloc: use `spare_capacity_mut` to reduce unsafe
  rust: alloc: add Vec::resize method
  rust: alloc: add Vec::truncate method
  rust: alloc: add missing invariant in Vec::set_len()

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